A temperature control circuit includes a microprocessor, a protection module, a temperature detecting module, and a heating module. The temperature detecting module includes a thermistor and a first switch. The thermistor is operable to sense a temperature to turn on or off the first switch for outputting a detection signal to the microprocessor and the protection module. The protection module is operable to control the microprocessor to work or reset according to the detection signal. The heating module includes a heater and a second switch. The microprocessor controls the second switch to turn on or off for making the heater work or stop working according to the detection signal.