Vacuum acid liquor circulation pickling tank system

The utility model relates to a vacuum acid liquor circulation pickling tank system. The pickling tank comprises a supporting platform, a pickling tank body arranged on the supporting platform and a sealing cover plate covering a tank opening of the pickling tank body. Characterized in that it is characterized in that it comprises, an acid liquid injection opening is formed in the wall surface of the pickling tank side tank close to the upper end tank opening; a water outlet is formed in the bottom end part of the tank wall surface of the side tank, a water adding port is formed in the tank wall surface of the other side of the pickling tank, close to the upper end tank port, an acid liquor outlet is formed in the bottom end part of the tank wall surface of the side tank, and circulation regulating valves are arranged on the acid liquor injection port, the water outlet, the water adding port and the acid liquor outlet. According to the utility model, contact between workers and acid liquor in the pickling tank