The fermentation tank used for anaerobic fermentation (such as the production of alcohol, solvents) can be simple in structure. For aerobic fermentation (such as the production of antibiotics, amino acids, organic acids, vitamins, etc.), the fermentation tank needs to be continuously filled with a large number of sterile air into the tank, and in order to consider the utilization rate of the air into the tank, it is relatively complex in the structure of the fermentation tank, commonly used are mechanical stirring type fermentation tank, bubble-type fermentation tank and air-lift type fermentation tank.