Fermentation tank

The fermentation tank provided by the utility model can be used for fully stirring strains in the tank body to react with materials and eliminating bubbles generated after reaction. The fermentation tank comprises a tank body and an upper seal head, the upper seal head is connected to the upper end of the tank body, the tank body comprises an inner barrel and a jacket barrel from inside to outside, and a discharge port is formed in the bottom of the inner barrel; a stirring system assembly is arranged on the upper sealing head and comprises a stirring motor, a stirring shaft connected with thestirring motor, a defoaming paddle and a stirring paddle, the defoaming paddle and the stirring paddle are arranged on the stirring shaft in a sleeving mode, the stirring shaft penetrates through theupper sealing head and extends into the inner barrel, and the stirring motor is fixedly arranged on the upper surface of the upper sealing head. The stirring paddle arranged in the tank body can fully stir the reaction of str