In the plastic sheet production process, the precise control of the temperature of each section of the extruder barrel and die is one of the important technologies related to product quality and performance. Based on a detailed analysis of the extruder temperature control principle, an extruder temperature control system with a programmable controller as the core and intelligent PID algorithm is optimized. Practice shows that the system improves the temperature control accuracy and better Meet the requirements of the production process and ensure the quality of the product.