The use of layer door device is prevent a layer elevator layer door that drops, including first board of door and layer door, wherein have the guide rail on the first board of door, a layer door top install with guide rail matched with hangs web wheel, be equipped with on the layer door with the guide rail cooperation is used for preventing a layer mousing-hook that drops, the gib head of layer door and mousing-hook is in the both sides of guide rail respectively, surround the pothook that turns over with the limiting layer door reveal along half at the bottom of being equipped with the first board of the family of a general on the door of layer. The utility model discloses an elevator layer door gear has been solved the door plant and has been received when striking, and the gallows on the door gear of layer is deviate from to the problem that results in the door plant to come off has also been solved simultaneously when a string web wheel breaks, problem that the gallows comes off this layer of door gear has simple structure, and the security performance is high, and the preparation installation is easy, characteristics with low costs