这个问题是由于我的MySQL的的的更新至8版本以上了，在安装的时候我并没有指定用户登入密码加密方式，所以默认被设置为caching_sha2_password 解决方法：
mysql> show variables like ‘default_authentication_plugin‘;
+-------------------------------+-----------------------+
| Variable_name | Value |
+-------------------------------+-----------------------+
| default_authentication_plugin |caching_sha2_password |
+-------------------------------+-----------------------+
1 row in set (0.03 sec)
// 查看本地mysql用户的信息
mysql> select host,user,plugin from mysql.user;
+-----------+------------------+----------------------+
| host | user | plugin |
+-----------+------------------+-----------------------+
| localhost | mysql.infoschema | caching_sha2_password|
| localhost | mysql.session | caching_sha2_password|
| localhost | mysql.sys | caching_sha2_password|
| localhost | root | caching_sha2_password|
+-----------+------------------+-----------------------+
4 rows in set (0.00 sec)
// 注意 caching_sha2_password， 只修改root的密码加密方式就可以了
mysql> ALTER USER ‘root‘@‘localhost‘ IDENTIFIED WITH mysql_native_password BY ‘123456‘;
Query OK, 0 rows affected (0.04 sec)
mysql> select host,user,plugin from mysql.user;
+-----------+------------------+-----------------------+
| host | user | plugin |
+-----------+------------------+-----------------------+
| localhost | mysql.infoschema | caching_sha2_password |
| localhost | mysql.session | caching_sha2_password |
| localhost | mysql.sys | caching_sha2_password |
| localhost | root | mysql_native_password |
+-----------+------------------+-----------------------+
————————————————
版权声明：本文为CSDN博主「龙筱福」的原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/qq_38879615/article/details/89184653
2059 – 身份验证插件’caching_sha2_password’-navicat连接异常
原文：https://www.cnblogs.com/Qcls/p/12587405.html