放在ui文件存放的目录下，复制下面代码，运行即可。

import os
import os.path


# UI 文件所在路径
cwd = os.getcwd()
dir = os.path.join(cwd, "ui")

print(dir)

# 列出目录下的所有UI文件
def listUiFile():
    list = []
    files = os.listdir(dir)
    print(files)
    for filename in files:
        if os.path.splitext(filename)[1] == '.ui':
            list.append(os.path.join(dir, filename))
    return list

# 把扩展名为.ui的文件改成扩展名为.py的文件
def transPyFile(filename):
    return os.path.splitext(os.path.join(dir, filename))[0] + '.py'

# 调用系统命令把UI文件转成Python文件
def runMain():
    list = listUiFile()
    for uifile in list:
        print(uifile)
        pyfile = transPyFile(uifile)
        print(pyfile)
        cmd = 'pyuic5 -o {pyfile} {uifile}'.format(pyfile=pyfile, uifile=uifile)
        os.system(cmd)
        
if __name__ == "__main__":
    runMain()