The invention discloses a method for the three-dimensional reconstruction of a defected part of the tip of an aeroengine compressor blade, and the method comprises the steps: 1), carrying out the preprocessing and clamping of the blade, removing an oxidation layer of a defected blade, clamping the blade, and enabling the to-be-welded cross section of the blade to be parallel to a horizontal plane; 2), carrying out image collection, building a three-eye stereoscopic vision measurement system, obtaining a three-dimensional gray scale image of the blade, and obtaining an edge image through edge detection; 3), calibrating a camera, completing the three-dimensional calibration of a vision system, and obtaining the conversion relation between camera image coordinates and the world coordinate system; (4), carrying out feature extraction, and obtaining the information of feature points from the edge image in a mode of combining edge tracking and feature point extraction; 5), stereo matching: carrying out the matching of the calibrated vision system, constructing a three-dimensional coordinate system of the blade, and obtaining a three-dimensional edge structure of the blade; 6), carrying out curved surface intersection and extension; 7), carrying out the three-dimensional molding of the defected part, carrying out fitting and reconstruction, and obtaining the structural data of the defected part of the blade.