Fermentor, a device for developing microbial fermentation on household products. The main body is usually made of stainless steel plate, and its volume is from 1m3 to hundreds of M3. We should be careful and rational in intentions and processes. It is sterilized by steam, has a fixed maneuvering flexibility, internal attachments can only be reduced (prevention of dead angle), material and energy transfer, and may not be treated so as to wipe out, reduce infection, be appropriate to the creation of a variety of works and reduce energy consumption.