Abstract. In order to ensure the pressing quality and production efficiency of the cotton insulation coating layer film, it is necessary to have an accurate temperature control for double roller heat sealing machine. Due to the characteristics of big inertia, pure time-delay, nonlinearity and imprecise mathematic model, Fuzzy-PID algorithm is proposed based on PLC system. The simulation results show that the proposed strategy improve the output characteristics. These excellent performances are a theoretical basis for further PLC programming.