简单来说将Qt\plugins\platforms下四个dll文件复制到bin\platform下
每个人前面路径不同
C:\Users\Administrator\AppData\Local\Programs\Python\Python38\Lib\site-packages\pyqt5_tools\Qt\plugins\platforms
C:\Users\Administrator\AppData\Local\Programs\Python\Python38\Lib\site-packages\pyqt5_tools\Qt\bin\platforms