Multi-layer safety air cushion

The utility model discloses a multi-layer safety air cushion. The multi-layer safety air cushion comprises at least three layers of air cushion bodies, wherein each layer of air cushion body is provided with an air charging port and an air exhaust port, a ventilation port is arranged between every two adjacent layers of air cushion bodies, the bottommost layer of air cushion body is connected with an expansion air bag, a valve port is arranged at the connecting position of the expansion air bag and the bottommost layer of air cushion body, the valve port is a one-way valve port, the passing direction of air is from the bottommost layer of air cushion body to the expansion air bag, and the valve port is opened when the air pressure at the valve port reaches preset air pressure. The multi-layer safety air cushion has the advantages that through the arranged expansion air bag, the pressure produced when an escaper jumps to the top of the multi-layer safety air cushion in the escape process can be transmitted to