这是8.0改了加密认证规则导致的。你可以去重新设置下密码

1.打开MySQL的命令行，输入数据库密码 

2.修改加密规则：ALTER USER 'root'@'localhost' IDENTIFIED BY 'password' PASSWORD EXPIRE NEVER; 

3.更新用户密码：ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'password'; 

4.刷新权限： FLUSH PRIVILEGES; 

5.重置密码：ALTER USER 'root'@'localhost' IDENTIFIED BY '新密码'