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With the continuous development of large-scale breeding industry, automated pig breeding has become a trend of pig breeding industry. In view of a series of stress behavior problems in the process of traditional pig weight measurement, this paper developed and studied a a Lidar Measurement System for Body Weight. Through the combination of hardware and software system with lidar as the core, the two-dimensional pig model was established. On this basis, The QT3D frame is used to construct the windows, and the windows are laid out horizontally and vertically to construct the 3D model windows of pigs. The volume of pigs was superimposed by Delaunay trigonometry. Using the volume data collected by the system to construct a mathematical model of volume and weight, the fitting accuracy R2 is 0.92535. Validation analysis of the model shows that the weight error is within ±8%. The system has the advantages of fast scanning speed, good modeling effective and accurate weight calculation. It provides a new technical research method for pig non-contact weight measurement and 3D modeling of point cloud data in related fields.