可能是附加依赖没有配置opencvworld310d.lib文件造成的
到项目属性->连接器->输入->附加依赖项看看有没有这个文件没有就把文件名复制添加进去试试
也有可能你之前只配置bebug或release模式运行时你选用另外一个
可以看看这个挺全的:https://zhuanlan.zhihu.com/p/199843813#:~:text=%E4%BA%8C%E3%80%81%E7%B3%BB%E7%BB%9F%E7%8E%AF%E5%A2%83%E9%85%8D%E7%BD%AE%20%E5%AE%89%E8%A3%85%E5%A5%BDVS%E5%92%8Copencv%E5%90%8E%EF%BC%8C%E9%9C%80%E8%A6%81%E5%AF%B9%E7%B3%BB%E7%BB%9F%E7%8E%AF%E5%A2%83%E5%8F%98%E9%87%8F%E8%BF%9B%E8%A1%8C%E9%85%8D%E7%BD%AE%EF%BC%8C%E5%85%B7%E4%BD%93%E6%AD%A5%E9%AA%A4%E5%A6%82%E4%B8%8B%EF%BC%9A,%EF%BC%881%EF%BC%89%E5%8F%B3%E9%94%AE%E6%AD%A4%E7%94%B5%E8%84%91-%3E%E5%B1%9E%E6%80%A7-%3E%E9%80%89%E6%8B%A9%E9%AB%98%E7%BA%A7%E7%B3%BB%E7%BB%9F%E8%AE%BE%E7%BD%AE%20%EF%BC%882%EF%BC%89%E4%BE%9D%E6%AC%A1%E9%80%89%E6%8B%A9%EF%BC%9A%E7%8E%AF%E5%A2%83%E5%8F%98%E9%87%8F-%3EPath-%3E%E7%BC%96%E8%BE%91%20%283%29%E9%80%89%E6%8B%A9%E6%96%B0%E5%BB%BA%EF%BC%8C%E7%84%B6%E5%90%8E%E8%BE%93%E5%85%A5%E5%88%9A%E6%89%8D%E7%9A%84%E5%AE%89%E8%A3%85%E8%B7%AF%E5%BE%84%2Bbuildx64vc14bin%E3%80%82