Elevator car speed monitoring system

The invention provides an elevator car speed monitoring system. The elevator car speed monitoring system comprises an elevator control board. The elevator car speed monitoring system further comprises a magnetic grid ruler. The magnetic grid ruler comprises a grid ruler, a magnetic grid sensor and a control box. The grid ruler of the magnetic grid ruler is vertically hung in an elevator well from the top portion of the well. The magnetic grid sensor is fixed on the outer wall of an elevator car, connected to the elevator control board through the control box and used for sending a collected first speed value of the elevator car to the elevator control board through the control box. The elevator control board is used for receiving the first speed value and conducting speed monitoring on the elevator car according to the first speed value. The elevator car speed monitoring system can accurately detect the actual speed of the elevator car, and is very high in safety and reliability.