In modern industrial three-dimensional measurement, simple system hardware structure, easy implementation and high-precision reconstruction methods are the main research directions. In view of the complexity of the laser scanning reconstruction method and the limited reconstruction accuracy of monocular structured light on complex or steep surfaces, research on the three-dimensional reconstruction system of workpieces with binocular structured light was carried out. Based on the self-constructed three-dimensional reconstruction platform, the encoded structured light pattern is projected, and the background of the target object is removed through the mask; the absolute phase of the image is solved by combining the complementary Gray code and the four-step phase shift method; the parallax holes in the disparity map are filled to achieve High-precision phase matching in weak texture areas; high-precision matching method is used to calculate the parallax of all pixels to achieve three-dimensional reconstruction of the workpiece to be tested. The innovation of the project is the use of structured light to improve the efficiency and accuracy of binocular image matching. Experimental results show that the matching accuracy of weak texture and repeated texture target areas is higher than the traditional binocular stereo matching algorithm, and can effectively reduce the influence of environmental noise and illumination changes, and obtain high-precision three-dimensional reconstruction results of the workpiece.