Safety lock for access control system

The utility model provides a safety lock for an access control system, which comprises a metal lock body and a door handle, a main PCB (printed circuit board) is arranged in the door handle, and a Bluetooth lock module is integrated on the main PCB; one end of the metal lock body is slidably connected with a spring bolt, an elastic piece is arranged in the metal lock body, one end of the elastic piece is connected with the spring bolt, and the other end of the elastic piece is connected with the metal lock body. A Hall PCB and a magnet are further arranged in the metal lock body, the Hall PCB is connected with the metal lock body in a fastened mode, the Hall PCB is connected with the main PCB, the magnet is connected with the elastic piece in a fastened mode, and the magnet is located between the spring bolt and the Hall PCB. The Hall PCB transmits a Hall signal to the Bluetooth lock module on the main PCB to judge the state of the metal lock body, the access controller connected with the Bluetooth lock modul