The invention discloses a thermography for medical treatment and a temperature control method. The thermography for the medical treatment comprises a radiant panel capable of generating far infrared, a microprocessor, a temperature sensor, a solid-state relay, an input button and a display screen, wherein the temperature sensor, the solid-state relay, the input button and the display screen are connected with the microprocessor, and the radiant panel is connected with the solid-state relay. The input button inputs a set temperature value into the microprocessor, the temperature sensor senses current temperature of the radiant panel in real time and sends a current temperature signal into the microprocessor in order to obtain an actual measured value, the microprocessor sends control signals to the solid-state relay in different duty ratio modes based on different stages which differentials between the actual measured value and the set temperature value belong to, and duty ratios of the control signals are decreased along with the decrease of the differentials. Compared with the prior art, the thermography for medical treatment and the temperature control method have the advantages of being stable in temperature control and good in treatment effect.