那么必须给root修改远程访问权限！步骤如下：

1.在服务器端定位到D:\server\mysql-8.0.15-winx64\bin,打开dos窗口，输入命令：

mysql -u root -p

(注：root表示登录的用户)

2.出现让输入密码，输入密码后回车，登录成功后，出现

E:\opt\mysql\mysql-8.0.15-winx64\bin>mysql -uroot -p

Enter password: ************

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 11

Server version: 8.0.15

Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

3.继续输入：use mysql，出现错误，如下：

mysql> use mysql

ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.

那么需要更改用户密码，输入命令：

alter user 'root'@'localhost' identified with mysql_native_password by 'amp';

结果如下：

mysql> alter user 'root'@'localhost' identified with mysql_native_password by 'amp';

Query OK, 0 rows affected (0.01 sec)

注：在mysql8版本中更改用户密码需要加入with mysql_native_password，并且要加入;所以一下两种写法都是不对的。

alter user 'root'@'localhost' identified by 'amp';

alter user 'root'@'localhost' identified with mysql_native_password by 'amp'

最后要输入flush privileges,刷新数据库。否则会保留在缓存中。结果如下：

mysql> flush privileges;

Query OK, 0 rows affected (0.00 sec)

4.继续输入命令：

use mysql

select host,user from user;

结果如下：

mysql> use mysql

Database changed

mysql> select host,user form user;

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that

corresponds to your MySQL server version for the right syntax to use near 'user'

 at line 1

mysql> select host,user from user;

+-----------+------------------+

| host      | user             |

+-----------+------------------+

| localhost | mysql.infoschema |

| localhost | mysql.session    |

| localhost | mysql.sys        |

| localhost | root             |

+-----------+------------------+

4 rows in set (0.00 sec)

果然，发现root用户的访问权限是localhost,需要修改host为%，输入命令：

update user set host='%' where user='root';

flush privileges;

结果如下:

mysql> update user set host='%' where user='root';

Query OK, 1 row affected (0.01 sec)

Rows matched: 1  Changed: 1  Warnings: 0

mysql> flush privileges;

Query OK, 0 rows affected (0.00 sec)

再次查询修改后结果，OK。结果如下：

mysql> select host,user from user;

+-----------+------------------+

| host      | user             |

+-----------+------------------+

| %         | root             |

| localhost | mysql.infoschema |

| localhost | mysql.session    |

| localhost | mysql.sys        |

+-----------+------------------+

4 rows in set (0.00 sec)

解决OK，远程登录开启成功。

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原文链接：https://blog.csdn.net/liliuqing/article/details/88723409