Machine vision enjoys increasingly wide application in intelligent manufacturing. This paper introduces a method for measurement of geometric parameters of L-shaped plate based on binocular vision model. First, the intrinsic and extrinsic parameters are obtained after calibration of the binocular camera| then, compared with the edge detection algorithm, the image of the L-shaped plate is processed with Sobel algorithm| in the end, based on triangulation theory, the three-dimensional coordinates of the feature points of the workpiece are extracted to work of the geometric parameters of the L-shaped plate. According to the experiment, the algorithm is of small measurement error and is able to meet the actual needs.