Self suction fermentation saves equipment such as air compressors, coolers, oil-water separators, air tanks, and main filters in air purification systems, reducing the footprint of factories. Reduce the investment in factory fermentation equipment by about 30%, for example, by using self-priming fermentation tanks to produce yeast, the output of yeast per liter volume can be as high as 30-50 grams. The equipment can be automated and continuous, reducing labor intensity and labor force. Yeast fermentation cycle is short, the concentration of yeast in the fermentation broth is high, and the amount of waste liquid after yeast separation is small. The device has a simple structure, high dissolved oxygen effect, and easy operation.