The stainless steel composite plate substrate produced by the hot rolling process can form a strong metallurgical bond between the stainless steel and has good mechanical properties. It can be processed by hot pressing, cold bending, cutting, welding and other processes. According to the different uses of the storage tank, the base material can be Q235B, Q345B, Q2456R, Q345R, A516, A387 and other common carbon steels and container steels of various brands at home and abroad. Various grades of stainless steel, such as 304, 316L, 1Cr13 and duplex stainless steel, can be used as the composite material. The material and thickness can be freely combined to meet the performance requirements of different chemical storage tanks.