The invention belongs to the technical field of medical equipment, and particularly relates to a noise reduction background device used for infrared thermography inspection. The noise reduction background device used for infrared thermography inspection comprises a background box with an inner cavity, a refrigerating device is arranged in the inner cavity of the box, and a temperature control device connected with the refrigerating device is arranged in the box. When the background device is used in cooperation with infrared thermography inspection, the signal to noise ratio can be effectively increased, and the imaging quality is greatly improved.