The sanitary fermentation tank is a fully enclosed vertical three-layer structure with heating, cooling, heat preservation and stirring functions. It is widely used in dairy, food, biological engineering, beverage, fruit wine and daily chemical industries. The tank body is equipped with jacket layer and insulation layer (heating, cooling and heat preservation). The tank body and upper and lower heads are all processed with R angles. The inner wall of the tank is mirror-polished, and the finish is Ra≤0.4μm, and there is no sanitary dead corner. Fully enclosed design, the materials are always mixed and fermented in a pollution-free state. The fermentation tank is equipped with air-breathing apparatus, CIP cleaning ball, sanitary manhole, sight glass, liquid level gauge, temperature sensor, material import and export, PH meter, heating and cooling medium import and export. The part of the fermenter in contact with the material is made of SUS304 or SU