diff --git a/astrbot/core/star/star_manager.py b/astrbot/core/star/star_manager.py
index 38bdc61d71..bd31d5df2a 100644
--- a/astrbot/core/star/star_manager.py
+++ b/astrbot/core/star/star_manager.py
@@ -559,7 +559,7 @@ def _load_plugin_i18n(plugin_path: str) -> dict[str, dict]:
                     continue
 
                 try:
-                    with file_path.open(encoding="utf-8") as f:
+                    with file_path.open(encoding="utf-8-sig") as f:
                         locale_data = json.load(f)
                     if isinstance(locale_data, dict):
                         translations[locale] = locale_data
@@ -575,6 +575,22 @@ def _load_plugin_i18n(plugin_path: str) -> dict[str, dict]:
 
         return translations
 
+    @staticmethod
+    def _load_plugin_config_schema(schema_path: str) -> dict:
+        """Load a plugin config schema, accepting an optional UTF-8 BOM."""
+        try:
+            with open(schema_path, encoding="utf-8-sig") as f:
+                return json.load(f)
+        except UnicodeDecodeError as exc:
+            raise ValueError(
+                f"插件配置 schema 必须使用 UTF-8 编码: {schema_path}"
+            ) from exc
+        except json.JSONDecodeError as exc:
+            raise ValueError(
+                f"插件配置 schema 不是有效的 JSON: {schema_path} "
+                f"(line {exc.lineno}, column {exc.colno})"
+            ) from exc
+
     @staticmethod
     def _normalize_plugin_dir_name(plugin_name: str) -> str:
         return plugin_name.strip()
@@ -1111,14 +1127,13 @@ async def load(
                 )
                 if os.path.exists(plugin_schema_path):
                     # 加载插件配置
-                    with open(plugin_schema_path, encoding="utf-8") as f:
-                        plugin_config = AstrBotConfig(
-                            config_path=os.path.join(
-                                self.plugin_config_path,
-                                f"{root_dir_name}_config.json",
-                            ),
-                            schema=json.loads(f.read()),
-                        )
+                    plugin_config = AstrBotConfig(
+                        config_path=os.path.join(
+                            self.plugin_config_path,
+                            f"{root_dir_name}_config.json",
+                        ),
+                        schema=self._load_plugin_config_schema(plugin_schema_path),
+                    )
                 logo_path = os.path.join(plugin_dir_path, self.logo_fname)
 
                 if path in star_map:
diff --git a/tests/test_plugin_manager.py b/tests/test_plugin_manager.py
index e51f9f35a1..d6bf22ee19 100644
--- a/tests/test_plugin_manager.py
+++ b/tests/test_plugin_manager.py
@@ -20,6 +20,32 @@
 TEST_PLUGIN_DIR = "helloworld"
 
 
+def test_load_plugin_config_schema_accepts_utf8_bom(tmp_path: Path):
+    schema_path = tmp_path / "_conf_schema.json"
+    schema_path.write_bytes(b'\xef\xbb\xbf{"type": "object"}')
+
+    assert PluginManager._load_plugin_config_schema(str(schema_path)) == {
+        "type": "object"
+    }
+
+
+def test_load_plugin_config_schema_accepts_utf8_without_bom(tmp_path: Path):
+    schema_path = tmp_path / "_conf_schema.json"
+    schema_path.write_text('{"type": "object"}', encoding="utf-8")
+
+    assert PluginManager._load_plugin_config_schema(str(schema_path)) == {
+        "type": "object"
+    }
+
+
+def test_load_plugin_config_schema_reports_invalid_json(tmp_path: Path):
+    schema_path = tmp_path / "_conf_schema.json"
+    schema_path.write_text("{invalid", encoding="utf-8")
+
+    with pytest.raises(ValueError, match="不是有效的 JSON"):
+        PluginManager._load_plugin_config_schema(str(schema_path))
+
+
 class MockStar:
     def __init__(self):
         self.root_dir_name = TEST_PLUGIN_DIR
@@ -59,9 +85,11 @@ def test_load_plugin_i18n_reads_locale_files(tmp_path: Path):
     plugin_path = tmp_path / "plugin"
     i18n_path = plugin_path / ".astrbot-plugin" / "i18n"
     i18n_path.mkdir(parents=True)
-    (i18n_path / "zh-CN.json").write_text(
-        json.dumps({"metadata": {"desc": "中文描述"}}, ensure_ascii=False),
-        encoding="utf-8",
+    (i18n_path / "zh-CN.json").write_bytes(
+        b"\xef\xbb\xbf"
+        + json.dumps({"metadata": {"desc": "中文描述"}}, ensure_ascii=False).encode(
+            "utf-8"
+        ),
     )
     (i18n_path / "en-US.json").write_text(
         json.dumps({"metadata": {"desc": "English description"}}),