The coupled stainless steel fermentation tank is a fermentation tank system that combines two fermentation tanks of the same specification. The middle part of the tank is the same. There is an isolation body in the middle, and except for the different strains, the culture medium can move around with each other. Each has its own independent control system; Integrated design of equipment, compact and small footprint. The equipment is refined and aesthetically pleasing, comparable to imported equipment. The equipment consists of three main parts: the tank body, pipeline, and control system, which are combined within the framework. The tank body is made of stainless steel SUS316 material. The material of the jacket is SUS304 stainless steel. Polishing accuracy in the tank Ra ≤ 0.4; External polishing accuracy Ra ≤ 0.6; The equipment design and manufacturing comply with GMP standards.