diff --git a/server/api/tasks.py b/server/api/tasks.py
index c67c568..5f4def9 100644
--- a/server/api/tasks.py
+++ b/server/api/tasks.py
@@ -181,7 +181,29 @@ def task_list(request):
 @api_view(["GET"])
 def task_detail(request, task_id):
     """查询指定任务的状态和结果。"""
+    # 先查内存
     task = task_dispatcher.get_task(task_id)
-    if not task:
+    if task:
+        return api_success(_task_to_dict(task))
+    
+    # 再查数据库（任务已完成的情况）
+    try:
+        from server.models import TaskLog
+        task_log = TaskLog.objects.get(task_id=task_id)
+        # 将数据库记录转换为相同格式
+        task_dict = {
+            "task_id": task_log.task_id,
+            "task_type": task_log.task_type,
+            "status": task_log.status,
+            "worker_id": task_log.worker_id,
+            "account_name": None,
+            "params": task_log.params,
+            "progress": None,
+            "result": task_log.result,
+            "error": task_log.error,
+            "created_at": task_log.created_at.strftime("%Y-%m-%dT%H:%M:%S"),
+            "updated_at": task_log.created_at.strftime("%Y-%m-%dT%H:%M:%S"),
+        }
+        return api_success(task_dict)
+    except Exception:
         return api_error(http_status.HTTP_404_NOT_FOUND, f"任务 {task_id} 不存在")
-    return api_success(_task_to_dict(task))