Access authentication method, device, equipment and medium

The invention discloses an access authentication method, device, equipment and medium, and the method comprises the steps: obtaining a target message sent by a target client and a physical address of the target client in an 802.1x authentication scene; judging whether the message type of the target message is an extended authentication protocol message; if yes, based on the physical address, performing access authentication on the target client by adopting an 802.1x user name password authentication mode; if not, based on the physical address, performing access authentication on the target client by adopting a physical address authentication mode. According to the application, the access authentication mode matched with the target client is automatically selected according to whether the message type of the target message is the extended authentication protocol message, so that the manual switching operation is omitted, human participation factors are reduced, the influence of manual operation on the switchin