diff --git a/app/core/plugin.py b/app/core/plugin.py
index 2959eb24..09c9b362 100644
--- a/app/core/plugin.py
+++ b/app/core/plugin.py
@@ -1552,8 +1552,7 @@ class PluginManager(ConfigReloadMixin, metaclass=Singleton):
         if plugin_info.get("icon"):
             plugin.plugin_icon = plugin_info.get("icon")
         # 标签
-        if plugin_info.get("labels"):
-            plugin.plugin_label = plugin_info.get("labels")
+        plugin.plugin_label = self._normalize_plugin_label(plugin_info.get("labels"))
         # 作者
         if plugin_info.get("author"):
             plugin.plugin_author = plugin_info.get("author")
@@ -1571,6 +1570,22 @@ class PluginManager(ConfigReloadMixin, metaclass=Singleton):
 
         return plugin
 
+    @staticmethod
+    def _normalize_plugin_label(labels: Any) -> Optional[str]:
+        """
+        规整插件市场标签字段，兼容旧字符串和新列表格式。
+
+        :param labels: 插件市场 package 中的 labels 字段
+        :return: 用空格拼接后的标签字符串，无法识别或为空时返回 None
+        """
+        if isinstance(labels, str):
+            label = labels.strip()
+            return label or None
+        if isinstance(labels, list):
+            normalized_labels = [str(item).strip() for item in labels if str(item).strip()]
+            return " ".join(normalized_labels) or None
+        return None
+
     async def async_get_online_plugins(self, force: bool = False) -> List[schemas.Plugin]:
         """
         异步获取所有在线插件信息
diff --git a/tests/test_plugin_helper.py b/tests/test_plugin_helper.py
index 9c76442a..72e6b9be 100644
--- a/tests/test_plugin_helper.py
+++ b/tests/test_plugin_helper.py
@@ -495,6 +495,39 @@ class TestPluginHelper:
         assert [item["version"] for item in cached] == ["1.2.3"]
         assert responses == []
 
+    def test_get_plugins_from_market_normalizes_list_labels(self, monkeypatch) -> None:
+        """
+        插件市场 labels 为列表时应转换为字符串，避免响应模型序列化异常。
+        """
+        try:
+            from app.core.plugin import PluginManager
+            from app.helper.plugin import PluginHelper
+        except ModuleNotFoundError as exc:
+            pytest.skip(f"missing dependency: {exc}")
+
+        market_plugins = {
+            "DemoPlugin": {
+                "name": "Demo Plugin",
+                "description": "Demo",
+                "version": "1.0.0",
+                "labels": ["站点", "通知", ""],
+                "v2": True,
+            }
+        }
+        plugin_manager = PluginManager()
+        monkeypatch.setattr(plugin_manager, "_plugins", {})
+        monkeypatch.setattr(plugin_manager, "_running_plugins", {})
+        monkeypatch.setattr("app.core.plugin.settings", SimpleNamespace(VERSION_FLAG="v2"))
+        monkeypatch.setattr("app.core.plugin.SystemConfigOper", lambda: SimpleNamespace(get=lambda _key: []))
+        monkeypatch.setattr("app.core.plugin.SitesHelper", lambda: SimpleNamespace(auth_level=1))
+        monkeypatch.setattr(PluginHelper, "get_plugins", lambda _self, *_args: market_plugins)
+
+        plugins = plugin_manager.get_plugins_from_market(REPO_URL)
+
+        assert len(plugins) == 1
+        assert plugins[0].plugin_label == "站点 通知"
+        assert plugins[0].model_dump()["plugin_label"] == "站点 通知"
+
     def test_get_online_plugins_force_keeps_release_cache_scoped(self, monkeypatch):
         """
         全市场刷新不清理 Release 缓存，Release 接口按请求仓库协调刷新两类数据。