In the process of image segmentation, if the noise in the image cannot be effectively suppressed, the segmentation accuracy of the image will be directly affected. In order to improve the segmentation effect of the image,a light change image segmentation method based on laser vision is proposed. The image is input into the laser vision system for noise removal, target enhancement and other processing. During the process, the control sensor in the system closely tracks the image processing process to improve the image processing effect; Obtain the image histogram,determine the selection range of the gray histogram threshold of the light transformation image according to the smoothing result of the histogram, divide the image into regions to obtain the corresponding threshold, and complete the accurate segmentation of the light image according to the determined threshold. The experimental results show that this method can effectively remove the image noise and achieve a good segmentation effect, it can achieve efficient and accurate segmentation of image targets.