The invention is suitable for the technical field of image processing and provides a pedestrian head identification method and system. The pedestrian head identification method comprises the steps of S1, collecting a depth image of a target region, and extracting a foreground image from the depth image; S2, extracting all regions of interest (ROI) from the foreground image; and S3, taking each pixel point in each ROI as a center of a circle, constructing a concentric circle to calculate a probability that the current pixel point belongs to the pixel points in head regions, obtaining a probability value of each pixel point in each ROI, comparing the probability value of each pixel point in each ROI with a preset first threshold, and filtering the pixel points with the probability values smaller than the first threshold, wherein the rest pixel points existent in a region form are points of the head regions, and each region is an identified head. According to the identification method provided by the invention, the head identification accuracy and efficiency are improved.