Door access control system based on 4G communication and door access authorization method of door access control system

The invention discloses a door access control system based on 4G communication. The door access control system comprises a door access device and a service center, wherein the door access device comprises a video acquisition module, a voice frequency module, an input/output module, a communication module and a door lock control module; the video acquisition module is used for acquiring visitor video information and transmitting the visitor video information to a central processing unit; the voice frequency module is used for acquiring voice frequency information and transmitting the voice frequency information to the central processing unit, and decoding voice frequency data which is received by the central processing unit and is transmitted by the service center; the input/output module is used for acquiring householder identity card information and password information; the communication module is communicated with the service center by a 4G communication system and is used for receiving a command and data transmitted by the service center, transmitting the command and data to the central processing unit and transmitting the data of the central processing unit to the service center; and the door lock control module is used for receiving a door lock opening/closing command of the central processing unit and carrying out opening/closing operation on a lock. The invention further provides a door access authorization method of the door access control system. According to the door access control system and the door access authorization method, remote user authorization can be realized, and potential safety hazards can be effectively prevented when identity authentication of an electronic card is carried out; and a door access switch can be flexibly, conveniently and safely operated.