The invention discloses a detection method for the performance of an anti-falling safety device of a building hoist. The method comprises the steps of controlling a lift car to ascend and reach the steady speed, and recording the torque of a driving motor in a steady speed time interval; controlling the driving motor to be converted into a torque control mode, and performing the state that no torque is output; when the lift car falls, opening the anti-falling safety device, recording a closed-loop vector feedback speed value of a controller or a speed estimation value of the controller under open-loop vector control at this moment, and starting timing; and when the speed of the lift car is zero, stopping timing. According to the detection method, detection can be performed on the construction site, the lift car of the building hoist does not need to be loaded, additional detection tools are not needed, and the brake action speed, brake torque and equivalent load brake distance of the anti-falling safety device can be detected.