diff --git a/admin-frontend-vue/src/api/users.ts b/admin-frontend-vue/src/api/users.ts
index 0b09c491..cfc003b7 100644
--- a/admin-frontend-vue/src/api/users.ts
+++ b/admin-frontend-vue/src/api/users.ts
@@ -1,4 +1,5 @@
 import { http } from './http'
+import { unwrap } from './envelope'
 import { parseUserPage } from './users-model'
 import {
   normalizeUserPageParams,
@@ -13,3 +14,9 @@ export async function fetchUserList(params: Partial<UserListParams> = {}): Promi
   const { data } = await http.get('/api/admin/users', { params: toUserListQuery(normalized) })
   return parseUserPage(data)
 }
+
+/** 删除用户：DELETE /api/admin/user/{uid}，success=false 由 unwrap 抛后端 message。 */
+export async function deleteUser(uid: number): Promise<void> {
+  const { data } = await http.delete<unknown>(`/api/admin/user/${uid}`)
+  unwrap<unknown>(data)
+}
diff --git a/admin-frontend-vue/src/pages/account/UsersPage.vue b/admin-frontend-vue/src/pages/account/UsersPage.vue
index 2b770f50..d092581d 100644
--- a/admin-frontend-vue/src/pages/account/UsersPage.vue
+++ b/admin-frontend-vue/src/pages/account/UsersPage.vue
@@ -1,11 +1,11 @@
 <script setup lang="ts">
 import { onMounted, reactive, ref } from 'vue'
 import { ElMessage, ElMessageBox } from 'element-plus'
-import { http } from '@/api/http'
 import type { AdminUser } from '@/types/admin'
-import { fetchUserList } from '@/api/users'
+import { deleteUser, fetchUserList } from '@/api/users'
 import { createUserFilterState, toUserListParams } from './users-filter'
 import { totalPageCount } from './user-pagination'
+import { deleteBlockReason } from './user-delete-model'
 
 const loading = ref(false)
 const rows = ref<AdminUser[]>([])
@@ -40,9 +40,14 @@ function search() {
 }
 
 async function removeUser(row: AdminUser) {
+  const reason = deleteBlockReason(row)
+  if (reason) {
+    ElMessage.warning(reason)
+    return
+  }
   try {
     await ElMessageBox.confirm(`确定删除用户“${row.username}”吗？`, '删除确认', { type: 'warning' })
-    await http.delete(`/api/admin/user/${row.id}`)
+    await deleteUser(row.id)
     ElMessage.success('删除成功')
     await loadUsers()
   } catch (error) {
diff --git a/admin-frontend-vue/src/pages/account/user-delete-model.ts b/admin-frontend-vue/src/pages/account/user-delete-model.ts
new file mode 100644
index 00000000..acb393fc
--- /dev/null
+++ b/admin-frontend-vue/src/pages/account/user-delete-model.ts
@@ -0,0 +1,24 @@
+/** 用户删除确认模型（任务 51）：删除确认文案 + 不可删原因，镜像 Java deleteUser 约束。 */
+import type { AdminUser } from '../../types/admin'
+
+/** 删除二次确认文案（删除后不可恢复）。 */
+export function deleteConfirmMessage(user: AdminUser | null | undefined): string {
+  const username = user?.username || ''
+  return `确定删除用户“${username}”吗？删除后不可恢复。`
+}
+
+/** 返回不可删除原因；可删除时返回 undefined。 */
+export function deleteBlockReason(
+  user: AdminUser | null | undefined,
+  currentUserId?: number | null,
+): string | undefined {
+  if (!user) return '用户信息缺失，无法删除'
+  if (currentUserId != null && user.id === currentUserId) return '不能删除当前登录账号'
+  if ((user.role || '').trim().toLowerCase() === 'super_admin') return '不能删除超级管理员'
+  return undefined
+}
+
+/** 该用户当前是否允许删除（非缺失/非自己/非超管）。 */
+export function isDeletableUser(user: AdminUser | null | undefined, currentUserId?: number | null): boolean {
+  return deleteBlockReason(user, currentUserId) === undefined
+}
diff --git a/admin-frontend-vue/tests/task-51.test.ts b/admin-frontend-vue/tests/task-51.test.ts
new file mode 100644
index 00000000..dd525485
--- /dev/null
+++ b/admin-frontend-vue/tests/task-51.test.ts
@@ -0,0 +1,63 @@
+import test from 'node:test'
+import assert from 'node:assert/strict'
+import { readSource } from './helpers.ts'
+import { deleteBlockReason, deleteConfirmMessage, isDeletableUser } from '../src/pages/account/user-delete-model.ts'
+import type { AdminUser } from '../src/types/admin.ts'
+
+test('test_task_051_user_delete_normal_primary_path', () => {
+  // 正常主路径：非超管且非当前登录账号可删除，确认文案带用户名。
+  const row: AdminUser = { id: 3, username: '运营一', role: 'normal' }
+  assert.equal(isDeletableUser(row, 1), true)
+  assert.equal(deleteBlockReason(row, 1), undefined)
+  assert.match(deleteConfirmMessage(row), /运营一/)
+})
+
+test('test_task_051_user_delete_normal_variant_input', () => {
+  // 正常变体：admin 角色用户亦可删除（仅超管/自己受限）。
+  assert.equal(isDeletableUser({ id: 4, username: 'mgr', role: 'admin' }, 1), true)
+  assert.equal(deleteConfirmMessage({ id: 4, username: 'mgr', role: 'admin' }), '确定删除用户“mgr”吗？删除后不可恢复。')
+})
+
+test('test_task_051_user_delete_normal_repeated_operation_is_idempotent', () => {
+  // 正常重复：纯函数结果稳定、不改输入。
+  const row: AdminUser = { id: 5, username: 'u', role: 'normal' }
+  assert.equal(deleteBlockReason(row, 1), deleteBlockReason(row, 1))
+  assert.equal(row.role, 'normal')
+})
+
+test('test_task_051_user_delete_boundary_empty_input', () => {
+  // 边界空值：缺用户行给可操作原因；空用户名不崩溃。
+  assert.match(deleteBlockReason(null, 1) || '', /用户/)
+  assert.equal(isDeletableUser(null, 1), false)
+})
+
+test('test_task_051_user_delete_boundary_single_item', () => {
+  // 边界单元素：单条普通用户可删除。
+  assert.equal(isDeletableUser({ id: 7, username: 'a', role: 'normal' }, 2), true)
+})
+
+test('test_task_051_user_delete_boundary_limit_or_missing_field', () => {
+  // 边界上限/缺当前 id：未带当前 id 时仅超管受限。
+  assert.equal(isDeletableUser({ id: 8, username: 'b', role: 'normal' }, undefined), true)
+  assert.match(deleteBlockReason({ id: 9, username: 'root', role: 'super_admin' }, 1) || '', /超级管理员/)
+})
+
+test('test_task_051_user_delete_invalid_input_rejected', () => {
+  // 异常输入：不能删自己、不能删超管。
+  assert.match(deleteBlockReason({ id: 1, username: 'me', role: 'normal' }, 1) || '', /当前登录/)
+  assert.equal(isDeletableUser({ id: 1, username: 'me', role: 'normal' }, 1), false)
+  assert.equal(isDeletableUser({ id: 9, username: 'root', role: 'super_admin' }, 2), false)
+})
+
+test('test_task_051_user_delete_dependency_failure_returns_actionable_message', () => {
+  // 依赖失败/删除走 adapter：页面不再内联 http.delete；users.ts 负责 DELETE + 解包。
+  const mod = readSource('src/pages/account/user-delete-model.ts')
+  assert.equal(/axios|http\./.test(mod), false, '删除模型保持纯逻辑')
+  const page = readSource('src/pages/account/UsersPage.vue')
+  assert.match(page, /deleteUser/)
+  assert.equal(/http\.delete/.test(page), false, '页面不再内联删除请求')
+  const users = readSource('src/api/users.ts')
+  assert.match(users, /deleteUser/)
+  assert.match(users, /http\.delete/)
+  assert.match(users, /api\/admin\/user/)
+})