The current point cloud reconstruction matrix of the pumping and storage construction site is generally set to be unidirectional, and the efficiency of point cloud reconstruction is low, which leads to the prolongation of point cloud reconstruction time. Therefore, the design and verification of point cloud reconstruction method for pumping and storage construction site underground 3D laser scanning technology are proposed. According to the actual point cloud reconstruction requirements and standards, the 3D point cloud primitive library is constructed first, and the multi-step method is adopted to improve the efficiency of point cloud reconstruction. The multi-step point cloud reconstruction matrix is designed. Based on this, the point cloud reconstruction model of the ground 3D laser scanning and storage construction site is established, and the point cloud reconstruction processing is realized by building topology matching. The test results show that after the measurement and analysis of five areas, the final point cloud reconstruction time of the unit project is well controlled below 0.25 s, which indicates that, with the assistance and support of the ground 3D laser scanning technology, the current point cloud reconstruction for the G pumping construction project is more effective, more targeted and it has a larger coverage of point cloud reconstruction, which has practical application value.