Abstract: This paper introduces the process flow of the production line for the automatic composite material purification tank shell molding production line, including robot loading, high-precision molding, robot picking, product grinding and laser drilling; the control system adopts the line body. Control PLC as the core, with the control scheme of distributed I/O, and adopts a limit switch detection mechanism to cooperate with the alarm system and network monitoring to ensure the safety and reliability of automated production. The wire body is applied to the automatic production of the new purification tank casing, which greatly improves the production efficiency and increased product pass rate.