Access control system, off-line cloud authorization system and method for access control and medium

The invention provides an access control system, an off-line cloud authorization system and method for access control and a medium. A cloud server sends an authorization file to a local server module through a mail, and authorization data is sent to a mobile terminal module for authorization application information passing auditing; the local server sends authorization information to the mobile terminal through mails; the mobile terminal module sends authorization application information to the cloud server module and stores authorization data. The method and the device are suitable for application scenes that direct data communication between the local server and the cloud server is forbidden, and the cloud server is forbidden to directly send the authorization file to the mobile terminal for authorization management. The local server is allowed to perform autonomous authorization management on the mobile terminal under the condition that the local server is offline with the cloud server, and cloud data is a