Safety door monitoring device, elevator and operation method

The invention relates to a safety door monitoring device. A safety door comprises two door panels and a door lock used for connecting the two door panels. The door lock comprises a lock hook arranged on one of the door panels. The monitoring device comprises a door panel position monitoring unit used for monitoring the positions of the door panels, a lock hook position monitoring unit used for monitoring the position of the lock hook, and a programmable electronic safety circuit board electrically connected with the door panel position monitoring unit and the lock hook position monitoring unit. According to the safety door monitoring device, an elevator and an operation method, the operation state of the safety door can be monitored in real time, and when the safety door breaks down, maintenance or rescue is conducted in time; and in addition, the monitoring units adopt the double-channel redundancy design and can complement each other, and it is guaranteed that the state of the safety door can be collected i