diff --git a/astrbot/cli/commands/cmd_service.py b/astrbot/cli/commands/cmd_service.py
index 91e28f2dd..0fe6f0a3a 100644
--- a/astrbot/cli/commands/cmd_service.py
+++ b/astrbot/cli/commands/cmd_service.py
@@ -366,6 +366,8 @@ def _build_windows_powershell_arguments(
     script = (
         "$ErrorActionPreference = 'Stop'\n"
         "$env:PYTHONUNBUFFERED = '1'\n"
+        "$env:PYTHONUTF8 = '1'\n"
+        "$env:PYTHONIOENCODING = 'utf-8'\n"
         "$cmdExe = if ($env:COMSPEC) { $env:COMSPEC } else { 'cmd.exe' }\n"
         f"$astrbotCommand = {_quote_powershell_literal(_build_windows_cmd_line(service_name, executable))}\n"
         "$process = Start-Process "
diff --git a/tests/test_cli_service.py b/tests/test_cli_service.py
index a76d040ed..5c192362a 100644
--- a/tests/test_cli_service.py
+++ b/tests/test_cli_service.py
@@ -146,6 +146,9 @@ def test_windows_task_xml_uses_astrbot_executable_and_working_directory():
     assert "<Command>powershell.exe</Command>" in task_xml
     assert "<Hidden>true</Hidden>" in task_xml
     assert "-WindowStyle Hidden" in task_xml
+    assert "$env:PYTHONUNBUFFERED = '1'" in powershell_script
+    assert "$env:PYTHONUTF8 = '1'" in powershell_script
+    assert "$env:PYTHONIOENCODING = 'utf-8'" in powershell_script
     assert "Start-Process" in powershell_script
     assert "-WindowStyle Hidden" in powershell_script
     assert "C:\\Users\\astrbot\\.local\\bin\\astrbot.exe" in powershell_script