Underground garage flood gate drainage device

The utility model discloses an underground garage flood gate drainage device, which relates to the technical field of flood gates and comprises a flood gate plate, two supports are fixedly connected to the end face of the flood gate plate, supporting rods are fixedly connected to the inner walls of the two supports through connecting shafts, one end of each supporting rod is fixedly connected to one end of the flood gate plate, and the other end of each supporting rod is fixedly connected to the other end of the flood gate plate. A through hole is formed in one end of the flood-proof door plate. By arranging the floating block, the rotating plate, the shunting hole and the through hole, water flow rises to drive the floating block to float upwards, water flow descends to drive the floating block to float downwards, the floating block drives one end of the rotating plate to rotate clockwise, the other end of the rotating plate rotates anticlockwise, and water flow slowly flows in through an opening formed betw