diff --git a/admin-frontend-vue/src/pages/tasks/duplicate-api.ts b/admin-frontend-vue/src/pages/tasks/duplicate-api.ts
index 472bae4b..bb77b637 100644
--- a/admin-frontend-vue/src/pages/tasks/duplicate-api.ts
+++ b/admin-frontend-vue/src/pages/tasks/duplicate-api.ts
@@ -1,6 +1,11 @@
 /** 店铺数据重复检查适配（任务 115-119）：/api/admin/shop-data-crawl/duplicate-check-* 系列端点。 */
 import { http } from '@/api/http'
-import { parseDuplicateItemsPage, parseDuplicateOverview, type DuplicateOverview } from './duplicate-model.ts'
+import {
+  parseDuplicateDetailPage,
+  parseDuplicateItemsPage,
+  parseDuplicateOverview,
+  type DuplicateOverview,
+} from './duplicate-model.ts'
 import { toDuplicateItemsQuery, type DuplicateFilter } from './duplicate-filter.ts'
 
 export const DUPLICATE_CHECK_ENDPOINT = '/api/admin/shop-data-crawl'
@@ -24,3 +29,15 @@ export async function fetchDuplicateItems(
   })
   return parseDuplicateItemsPage(data)
 }
+
+/** 加载撞款详情卡片分页：GET /duplicate-check-detail。 */
+export async function fetchDuplicateDetail(
+  filter: DuplicateFilter,
+  page: number,
+  pageSize: number,
+): Promise<ReturnType<typeof parseDuplicateDetailPage>> {
+  const { data } = await http.get<unknown>(`${DUPLICATE_CHECK_ENDPOINT}/duplicate-check-detail`, {
+    params: toDuplicateItemsQuery(filter, page, pageSize),
+  })
+  return parseDuplicateDetailPage(data)
+}
diff --git a/admin-frontend-vue/src/pages/tasks/duplicate-model.ts b/admin-frontend-vue/src/pages/tasks/duplicate-model.ts
index d08b9f53..2a1cd2e8 100644
--- a/admin-frontend-vue/src/pages/tasks/duplicate-model.ts
+++ b/admin-frontend-vue/src/pages/tasks/duplicate-model.ts
@@ -139,6 +139,60 @@ function parseDuplicateMetrics(raw: unknown): DuplicateMetrics | null {
   }
 }
 
+/** 撞款详情卡(抽屉)：跨店聚合一张卡片。 */
+export interface DuplicateDetail {
+  asin: string
+  shopCount: number
+  recordCount: number
+  shopNames: string[]
+  brand: string
+  firstDate: string
+  occurrences: DuplicateOccurrence[]
+}
+
+/** 解析单张撞款详情卡；缺 asin 视为无效。 */
+export function parseDuplicateDetail(raw: unknown): DuplicateDetail | null {
+  if (!raw || typeof raw !== 'object') return null
+  const r = raw as Record<string, unknown>
+  const asin = text(r.asin)
+  if (!asin) return null
+  const shopNamesRaw = r.shop_names ?? r.shopNames
+  const shopNames = Array.isArray(shopNamesRaw)
+    ? (shopNamesRaw as unknown[]).map((name) => text(name)).filter(Boolean)
+    : []
+  return {
+    asin,
+    shopCount: count(r.shop_count ?? r.shopCount),
+    recordCount: count(r.record_count ?? r.recordCount),
+    shopNames,
+    brand: text(r.brand),
+    firstDate: text(r.first_date ?? r.firstDate),
+    occurrences: Array.isArray(r.occurrences)
+      ? r.occurrences.map((occ) => parseDuplicateOccurrence(occ)).filter((occ): occ is DuplicateOccurrence => occ !== null)
+      : [],
+  }
+}
+
+/** 详情分页负载(data: {pending,items,total,page,page_size}) → 前端结果。 */
+export function parseDuplicateDetailPage(payload: unknown): {
+  pending: boolean
+  items: DuplicateDetail[]
+  total: number
+  page: number
+  pageSize: number
+} {
+  const core = unwrap<unknown>(payload)
+  const record = core && typeof core === 'object' ? (core as Record<string, unknown>) : {}
+  const items = Array.isArray(record.items)
+    ? record.items.map((raw) => parseDuplicateDetail(raw)).filter((detail): detail is DuplicateDetail => detail !== null)
+    : []
+  const total = count(record.total)
+  const pageNumber = count(record.page) >= 1 ? count(record.page) : 1
+  const rawSize = record.page_size ?? record.pageSize
+  const pageSize = count(rawSize) >= 1 ? count(rawSize) : 20
+  return { pending: record.pending === true, items, total, page: pageNumber, pageSize }
+}
+
 /** 明细列表分页负载(data: {pending,items,total,page,page_size}) → 前端结果。 */
 export function parseDuplicateItemsPage(payload: unknown): {
   pending: boolean
diff --git a/admin-frontend-vue/tests/task-118.test.ts b/admin-frontend-vue/tests/task-118.test.ts
new file mode 100644
index 00000000..0e883216
--- /dev/null
+++ b/admin-frontend-vue/tests/task-118.test.ts
@@ -0,0 +1,81 @@
+import test from 'node:test'
+import assert from 'node:assert/strict'
+import { readSource } from './helpers.ts'
+import { parseDuplicateDetail, parseDuplicateDetailPage } from '../src/pages/tasks/duplicate-model.ts'
+
+test('test_task_118_duplicate_detail_normal_primary_path', () => {
+  // 正常主路径：详情卡(snake)解析为类型化详情。
+  const detail = parseDuplicateDetail({
+    asin: 'B0ABC',
+    shop_count: 3,
+    record_count: 4,
+    shop_names: ['A店', 'B店', 'C店'],
+    brand: 'X',
+    first_date: '2026-01-01',
+    occurrences: [
+      { asin: 'B0ABC', shop_name: 'A店', country: 'DE', date: '2026-01-01', price: '9.9', brand: 'X' },
+      { asin: 'B0ABC', shop_name: 'B店', country: 'DE', date: '2026-01-02', price: '10.1', brand: 'X' },
+    ],
+  })
+  assert.equal(detail.asin, 'B0ABC')
+  assert.equal(detail.shopCount, 3)
+  assert.deepEqual(detail.shopNames, ['A店', 'B店', 'C店'])
+  assert.equal(detail.brand, 'X')
+  assert.equal(detail.firstDate, '2026-01-01')
+  assert.equal(detail.occurrences.length, 2)
+})
+
+test('test_task_118_duplicate_detail_normal_variant_input', () => {
+  // 正常变体：详情分页负载解析。
+  const page = parseDuplicateDetailPage({
+    data: { pending: false, items: [{ asin: 'B0X', shop_count: 2, record_count: 2, shop_names: ['A'], occurrences: [] }], total: 1, page: 1, page_size: 6 },
+  })
+  assert.equal(page.items.length, 1)
+  assert.equal(page.items[0].asin, 'B0X')
+  assert.equal(page.pageSize, 6)
+})
+
+test('test_task_118_duplicate_detail_repeated_is_idempotent', () => {
+  // 正常重复：解析稳定、不改输入。
+  const payload = { data: { items: [{ asin: 'A', shop_count: 1, record_count: 1, shop_names: [], occurrences: [] }], total: 1, page: 1, page_size: 6 } }
+  assert.deepEqual(parseDuplicateDetailPage(payload), parseDuplicateDetailPage(payload))
+})
+
+test('test_task_118_duplicate_detail_boundary_empty_input', () => {
+  // 边界空值：pending 空详情列表。
+  const page = parseDuplicateDetailPage({ data: { pending: true, items: [], total: 0, page: 1, page_size: 6 } })
+  assert.equal(page.pending, true)
+  assert.deepEqual(page.items, [])
+})
+
+test('test_task_118_duplicate_detail_boundary_single_item', () => {
+  // 边界单元素：单详情卡无店名列表。
+  const detail = parseDuplicateDetail({ asin: 'S', shop_count: 1, record_count: 1, occurrences: [] })
+  assert.ok(detail)
+  assert.deepEqual(detail.shopNames, [])
+  assert.equal(detail.brand, '')
+})
+
+test('test_task_118_duplicate_detail_boundary_limit_or_missing_field', () => {
+  // 边界上限/缺字段：缺字段回默认。
+  const detail = parseDuplicateDetail({ asin: 'Z' })
+  assert.ok(detail)
+  assert.equal(detail.shopCount, 0)
+  assert.equal(detail.firstDate, '')
+})
+
+test('test_task_118_duplicate_detail_invalid_input_rejected', () => {
+  // 异常输入：缺 asin 详情视为无效；success=false 抛后端 message。
+  assert.equal(parseDuplicateDetail('garbage'), null)
+  assert.equal(parseDuplicateDetail({ shop_count: 2 }), null)
+  assert.throws(() => parseDuplicateDetailPage({ success: false, message: '无权查看详情' }), /无权查看/)
+})
+
+test('test_task_118_duplicate_detail_dependency_failure_returns_actionable_message', () => {
+  // 依赖失败/加载走 adapter：GET /duplicate-check-detail。
+  const api = readSource('src/pages/tasks/duplicate-api.ts')
+  assert.match(api, /\/duplicate-check-detail/)
+  assert.match(api, /fetchDuplicateDetail/)
+  const model = readSource('src/pages/tasks/duplicate-model.ts')
+  assert.equal(/axios|http\./.test(model), false, '详情解析保持纯逻辑')
+})