Fall-preventing emergency device for elevator

The invention particularly relates to a fall-preventing emergency device for an elevator, and aims at providing a fall-preventing safety system which is simple in structure, low in cost, safe and reliable, and effectively protects the safety of passengers. The fall-preventing safety system comprises airbag assemblies, wherein each of the airbag assemblies comprises a safe airbag, an air generator, an ignition device and an electronic controller; the airbag assemblies are arranged in accommodating holes which are formed under an elevator gateway and horizontally formed in the side wall of an elevator shaft; grooves are formed in a side wall opposite to the other side with the accommodating holes, of the elevator shaft; a speed sensor and a height sensor are arranged in a lift car; output signals of the speed sensor and the height sensor are transmitted to the electronic controller. According to the fall-preventing emergency device disclosed by the invention, when the lift cars falls, one or a plurality of airbags, which are the closest to the lift car under the lift car act so as to open the airbags, so that the falling speed of the lift car is decreased rapidly until the lift car stops falling; because the fall impact force of the lift car is small, the body safety of the passengers can be protected effectively.