The present invention provides a laser 3D contour positioning projection method based on binocular vision. Through using a binocular stereo vision system, the spatial coordinates of a discrete point sequence of a three-dimensional contour curve on a projected object in a binocular system coordinate system are obtained, through the coordinates and a calibration of a laser galvanometer scanning system, a series of signals needed by projection are calculated to complete laser 3D contour positioning projection, the projection method has the advantages of a good projection effect, high positioning precision and low cost of required hardware equipment and is easy to apply in various industries.