The resistance furnace temperature tracking control system based on Siemens S7-200 PLC was developed to solve the problem of temperature tracking control precision of resistance furnace. The constant temperature value PID control program and the temperature segmental setting tracking program were compiled. Through the touch screen interface, the temperature rise curve can be easily set and the actual temperature trend data can be displayed in real time. After the actual operation test, the PID temperature control algorithm has proven a good control effect, and each control indicator can meet the on-site process requirements.