Flat layer anti-falling structure and method applied to stereo garage

The invention relates to a flat layer anti-falling structure and method applied to a stereo garage. The flat layer anti-falling structure comprises a plurality of stop pieces and a plug pin assembly,wherein the stop pieces are mounted on the side wall of a lifting channel in the stereo garage and protrude out of the side wall of the lifting channel; the plug pin assembly is mounted on the outer wall of a lift car in the stereo garage and comprises a plug pin capable of horizontally stretching out and drawing back along the outer wall of the lift car, and the plug pin can stretch out of the lift car and be supported by stop blocks after the lift car is parked at different parking layer positions; and the relative position relation of the stop pieces, the plug pin assembly, the lift car andthe lifting channel is set in the mode that when the lift car is supported at the different parking layer positions through the stop blocks, the upper surfaces of parking layers are flush with the upper surface of a bottom pl