Active safety buffer device for elevator

An active safety buffer device of an elevator comprises an elevator car, and a plurality of buffer supports capable of being switched between a folded state and an unfolded state are arranged at the bottom of the elevator car. The elevator car is provided with a driving mechanism for controlling the buffer support to keep a folded state or an unfolded state and a controller capable of controlling the driving mechanism to work according to the over-speed descending speed of the elevator car. When the controller knows that the elevator car descends in an overspeed mode, the controller controls the driving mechanism to release the buffer support, the buffer support is overturned and unfolded downwards under the action of gravity and the elastic force of the driving spring until the buffer support is vertically arranged, the buffer support keeps the unfolded state to make contact with the bottom of the pit in advance for buffering, and the overspeed descending speed and impact force of the elevator car are reduce