Double-layer folding type landing door device for construction hoist

The invention relates to a double-layer folding landing door device for a construction hoist, which comprises a mounting frame, a plurality of fixing assemblies, a first landing door, a second landing door and a door picking assembly, and the mounting frame is fixedly connected with the plurality of fixing assemblies; in the actual use process of the construction hoist, the installation frame can be installed on a building through the fixing assembly, the door lifting assembly is installed on a cage door of the construction hoist, when the cage door of the construction hoist is opened, the cage door can drive the door lifting assembly to lift the first landing door firstly, so that the first landing door slides on the first sliding groove, and the second landing door slides on the second sliding groove. Then the second landing door is lifted up, the second landing door slides on the second sliding groove, before the construction elevator leaves, the cage door of the construction elevator is closed, meanwhile,