Automatic drainage device of drying suction filter

The utility model belongs to the technical field of suction filters, and particularly relates to an automatic drainage device of a drying suction filter, which comprises a water-gas separation tank, a water-gas separation tank, a water-gas separation tank, a water-gas separation tank and a water-gas separation tank, the top of the water-gas separation tank is connected with an exhaust pipe, and the side wall of the water-gas separation tank is provided with a water-gas inlet; the water storage tank is horizontally arranged, and the upper part of one side, close to the water-gas separation tank, of the water storage tank is communicated with the bottom of the water-gas separation tank through a connecting pipe; a drain pipe is connected to the lower part of one side, far away from the water-gas separation tank, of the water storage tank; a pneumatic flange butterfly valve is arranged on each of the drain pipe and the connecting pipe; a pneumatic flange ball valve is further arranged at the top of the water sto