Automatic gravity door closing mechanism

The utility model provides an automatic gravity door closing mechanism, which relates to the technical field of protective equipment, and comprises an opening and closing door, a left vertical door and a right door, the top of the opening and closing door close to one side is fixedly connected with a clamping square frame, the interior of the clamping square frame is movably connected with a square frame, and short rods are movably embedded in the square frame; the opposite ends of the two short rods are both fixedly connected with springs, the two springs are both fixedly connected into the springs, the square frame and the clamping square frame are both movably connected through the short rods, the rear side face, close to the center, of the square frame is fixedly connected with an iron wire, and one end of the iron wire is movably sleeved with a take-up wheel. The take-up wheel is fixedly connected to the top, close to one side, of the right door, one end of the iron wire is fixedly connected with a gravi