Microbial fertilizer fermentation device

The microbial fertilizer fermentation device comprises a fermentation tank, a top cover is arranged at the top of the fermentation tank, a main stirring shaft, an auxiliary stirring shaft and an auxiliary circulation assembly are arranged in the fermentation tank, the auxiliary stirring shaft is in transmission connection with the main stirring shaft, and the auxiliary circulation assembly is in transmission connection with the main stirring shaft; an air-entrapping assembly is arranged at the bottom in the fermentation tank, and the main stirring shaft and the auxiliary stirring shaft are rotationally connected with the air-entrapping assembly. The device has the beneficial effects that when the device is used, the mixing effect of microbial strains and biological matrixes in fertilizer liquid in the fermentation process is improved, and in the fermentation process of microbial fertilizer with aerobic microorganisms such as bacillus subtilis as main fungi, the mixing uniformity of the fertilizer and oxygen i