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@echo off&setlocal enabledelayedexpansion
set "f=D:\txt文件夹"
set "fd=E:\123文件夹\"
for /f "delims=" %%f in ('dir /b /a-d "%f%\*.txt"') do set /a n+=1&set "_!n!=%%~f"
for /f "delims=" %%d in ('dir /b /ad "%fd%"') do (
     set /a r=!random!%%n+1
     for %%b in (!r!) do copy "%f%\!_%%b!" "%fd%%%d\"
)
pause
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