Pressure control type automatic water drainage device

The utility model relates to the technical field of pressure water drainage, and discloses a pressure control type automatic water drainage device which is characterized in that connecting plates are mounted at four corners of the bottom of a sealing plate, supporting springs are mounted at the bottoms of the connecting plates, supporting rods are arranged in the middles of the supporting springs, and the top ends of the supporting rods are mounted at the bottoms of the connecting plates; the bottom ends of the supporting springs are installed on the upper surface of the base, limiting grooves are formed in the positions, corresponding to the supporting rods, of the base, and the supporting rods are inserted into inner cavities of the limiting grooves in the corresponding positions. The sealing plate can intercept water in the water storage chamber, downward pressure is applied to the sealing plate when the water amount in the water storage chamber is increased, the sealing plate can apply pressure to the sup