The invention discloses a flocculating agent hydrolysis apparatus used for processing sewage. The flocculating agent hydrolysis apparatus comprises an agitator tank and a liquid storage tank, the agitator tank is arranged at the liquid storage tank, a cover realizes threaded connection with an upper end of the agitator tank, and a stirring mechanism is arranged at the cover; and several spiral grooves with a same rotation direction are arranged at an inside wall of the liquid storage tank. According to the flocculating agent hydrolysis apparatus, the agitator tank and the liquid storage tank are fixed in a stable mode, dismounting and assembly are convenient, cleaning is convenient, the stirring efficiency of the stirring mechanism is high, the flocculating agent can be fully hydrolyzed, asolution in the liquid storage tank is in a stirring state while being heated by the spiral grooves in the liquid storage tank, and deposition under low-temperature or long-time standing condition can be avoided.