The overall thinness and thickness of the storage tank ensures the uniform force and reasonable design of the pipe joint, and ensures the mechanical strength and safety reliability of the storage tank. It can safely hold all kinds of corrosive liquid. In addition to good sealing performance, the tank also has the advantages of light weight and exquisite appearance, which is more reliable than plastic roll molding process, plastic plate welding, FRP winding, hand paste process, carbon steel lining process and other processes.