for /f %i in ('dir d:\*.svn /ad /s /b') do if "%~nxi"==".svn" rd "%i" /s /q 2>nul

------解决方案--------------------
test.bat

BatchFile code

@echo off
for /f "delims=" %%a in ('dir /s /b /ad "C:\test\"') do (
    if "%%~nxa" equ ".svn" (
        rd /s /q "%%a"
    )
)