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Aiming at the deficiency of temperature control precision of traditional electric-controlled physiotherapy instrument, a real-time temperature control system of infrared physiotherapy instrument based on PWM is proposed. On the basis of analyzing the principle of PWM infrared temperature control technology, the hardware structure of the system is designed, which mainly includes microcontroller, heating module, temperature controller, DC regulated power supply, digital display and so on. Sampling and pulse width adjustment can realize accurate adjustment and control of the temperature of physiotherapy instrument. The experimental results show that the deviation of temperature control system is less than 1.36%, and the performance of infrared signal amplitude is more stable.