diff --git a/app/modules/qbittorrent/__init__.py b/app/modules/qbittorrent/__init__.py
index 6da0da0c6..b1441376f 100644
--- a/app/modules/qbittorrent/__init__.py
+++ b/app/modules/qbittorrent/__init__.py
@@ -218,6 +218,7 @@ class QbittorrentModule(_ModuleBase, _DownloaderBase[Qbittorrent]):
                             if settings.TORRENT_TAG and settings.TORRENT_TAG not in torrent_tags:
                                 logger.info(f"给种子 {torrent_hash} 打上标签：{settings.TORRENT_TAG}")
                                 server.set_torrents_tag(ids=torrent_hash, tags=[settings.TORRENT_TAG])
+                            server.delete_torrents_tag(torrent_hash, tag)
                             return downloader or self.get_default_config_name(), torrent_hash, torrent_layout, f"下载任务已存在"
                 finally:
                     torrents.clear()
diff --git a/tests/test_qbittorrent_compat.py b/tests/test_qbittorrent_compat.py
index 88c7112d1..eb13980fd 100644
--- a/tests/test_qbittorrent_compat.py
+++ b/tests/test_qbittorrent_compat.py
@@ -541,6 +541,30 @@ def test_download_falls_back_to_tag_lookup_when_added_ids_missing():
     fake_server.get_torrent_id_by_tag.assert_called_once_with(tags="tmp-tag-01")
 
 
+def test_download_removes_temporary_tag_from_existing_torrent():
+    """重复添加任务时应从已存在的种子中删除本次临时标签。"""
+    fake_server = MagicMock()
+    fake_server.add_torrent.return_value = (False, [])
+    fake_server.get_content_layout.return_value = "Original"
+    fake_server.get_torrents.return_value = ([{
+        "name": "test",
+        "total_size": len(b"torrent-content"),
+        "hash": "existing123",
+        "tags": "tmp-tag-01,moviepilot-tag",
+    }], None)
+
+    module = _build_module(fake_server)
+    result = module.download(
+        content=b"torrent-content",
+        download_dir=Path("/downloads"),
+        cookie="",
+        downloader="qb",
+    )
+
+    assert result == ("qb", "existing123", "Original", "下载任务已存在")
+    fake_server.delete_torrents_tag.assert_called_once_with("existing123", "tmp-tag-01")
+
+
 def test_get_files_retries_until_qbittorrent_files_available():
     """qBittorrent 添加任务后文件列表短暂未就绪时应重试。"""
     torrent_files = [{"id": 12, "name": "Show.S01E12.mkv"}]