Remote upgrading method for unattended access control system

The invention discloses an unattended access control system which comprises an equipment end and a server, wherein the equipment end comprises an access control app and an access control updating app, the access control app is used for calling a server interface, and the access control updating app is used for installing a new version of access control app; the server comprises a door opening logic module, a file uploading/downloading module and an access control app management module, the door opening logic module performs signal transmission with the access control app and is used for judging whether a card number transmitted on the access control app has the door opening permission, and the file uploading/downloading module performs signal transmission with the access control updating app and is used for putting a new version of access control app uploaded by a user into a specified folder and searching for a corresponding file in the specified folder, and the access control app management module is used f