The invention relates to a thermal imaging fusion visible light image processing method, system and storage medium, comprising the following steps: 1, a camera collects visible light data and outputsan RGB image; 2, an infrared detector collects infrared radiation data and outputs that data; 3, RGB image backup; 4, convert that RGB image into a grayscale image; 5, Gaussian filtering of grayscaleimage; 6, calculate that gradient and the direction; 7, non-maximum suppression; 8, adaptive double threshold calculation; 9, image edge detection; 10, connecting edge points to output edge image; 11,synthesize an RGB image with edge lines; 12, bad point treatment; 13, first-order hysteresis filter; 14, non-uniformity correction; 15, adde a color palette to convert that color palette into an infrared thermal image; 16, infrared thermal image enhancement. 17, an image enlarge adaptive screen; 18, image display. The invention fuses visible light images by infrared thermal imaging, so that humaneyes can better observe the temperature distribution of the measured scene from the thermal imager.