The invention relates to a moment limiter capable of automatically controlling an overload warning to be relieved. The moment limiter comprises a hydraulic reversing valve, a guiding rod, a position sensor, a position baffle and a control host. The hydraulic reversing valve is connected with hoisting equipment, and the movement direction of the hoisting equipment is controlled. The position baffle is installed on a safety operation handle and can move along the guiding rod along with the safety operation handle. The position sensor is installed above the position baffle. The signal output end of the position sensor is connected with the control host, and the position sensor is used for monitoring the position of the position baffle and sending a triggering signal to the control host. The control host relieves an overload warning signal according to the triggering signal sent by the position sensor. The moment limiter achieves the function of automatic warning relief, can also effectively protect the safety of the hoisting equipment and can be widely applied to the field of engineering hoisting equipment.