Elevator light curtain is a kind of light-type elevator door safety protection device, which is suitable for passenger elevator and cargo elevator to protect the safety of passengers. It consists of an infrared transmitter and receiver mounted on both sides of the elevator door, a power box mounted on the top of the car and a special flexible cable. There are 32 (16) infrared transmitting tubes in the transmitter. Under the control of MCU, the transmitting and receiving tubes are opened successively, and the car door area is scanned continuously from top to bottom, forming a dense infrared protective light curtain. When any beam of light is blocked, the control system will immediately output the signal to open the door, the door will stop closing and reverse open, until the passenger or the barrier leaves the warning