升级为最新版本pip后也未能成功安装opencv-python,于是手工下载opencv_python-4.1.1.26-cp37-cp37m-win_amd64.whl(下载地址:https://pypi.org/project/opencv-python/#files),将安装包存放到projectXXX\venv\Lib\site-packages目录下,在pycharm Terminal端切换到该目录下(cd projectXXX\venv\Lib\site-packages),执行pip iinstall opencv_python-4.1.1.26-cp37-cp37m-win_amd64.whl即可。