Double-layer civil air defense door

The utility model discloses a double-layer civil defense door, and belongs to the technical field of civil defense doors. A double-layer civil air defense door comprises a first door body and a second door body. The first door body and the second door body are symmetrically arranged; a cylinder body of the air cylinder is fixedly connected with the first door body; the first push plate is fixedly connected with a piston of the air cylinder; the mounting plate is fixedly connected with the first door body; the first rack is fixedly connected with the first push plate; the first rotating shaft is rotationally connected with the mounting plate; the first gear is fixedly connected with the first rotating shaft; the first clamping block is fixedly connected with the first rotating shaft; the first limiting block is fixedly connected with the first door body; the second limiting block is fixedly connected with the second door body; the first rack and the first gear are arranged in a meshed mode. The first clamping