Entrance guard unlocking method and system

The invention discloses an entrance guard unlocking method and system. The method comprises the following steps that an entrance mainframe of an entrance guard system is connected with a mobile terminal in a wireless communication manner; the entrance mainframe receives an unlocking code sent by the mobile terminal, and the unlocking code is an unlocking code generated by the mobile terminal according to resident information; the resident information comprises one or multiple of a cell number, a building number, a unit number, a floor number and a room number of a resident; the entrance mainframe performs matching analysis on the unlocking code and a resident information database, and if the unlocking code is matched with data in the resident information database, the entrance mainframe unlocks an entrance lock. On the basis of a wireless communication data transmission mode between the entrance mainframe and the mobile terminal, the entrance guard unlocking method and the entrance guard unlocking system which are provided by the invention can realize remote control unlocking on the entrance guard system by a user, thus greatly improving the convenience in unblocking by the user and the unlocking efficiency, and enriching the entrance guard unlocking experience of the user.