Anaerobic fermentation gas storage device

The utility model discloses an anaerobic fermentation gas storage device, and belongs to the field of gas storage devices, the anaerobic fermentation gas storage device comprises a tank body, a gas storage bag is arranged at the top end of the tank body, an inner water tank and an outer water tank are arranged in the tank body through a baffle ring, the bottom end of the gas storage bag is located in the outer water tank, and a three-phase separator and a water distributor are arranged on the inner wall of the bottom end of the inner water tank; an air pressure balance assembly and an air guide pipe are arranged on the surface of the air storage bag, a first control valve is arranged on the side wall of the air guide pipe, a water inlet pipe and a water drainage pipe which are symmetrically distributed are fixedly installed on the side wall of the tank body, the water inlet pipe is located above the water drainage pipe, and supporting blocks distributed in an annular array are fixedly installed on the side wa