Abstract: This paper introduced and summarized the single-frame image processing method and sequence image processing method in image processing for infrared thermography. Single-frame image processing methods included distortion correction, image vertical fringe removal, image filtering, and image enhancement; Sequence image processing methods included heat wave signal reconstruction technology, principal component analysis, independent component analysis, pulse phase method, and peak value of second-order derivative. The infrared image was processed with the above method and the results were compared. Finally, the development trend of infrared thermography image processing methods was summarized.