Aiming at the problems of heavy workload, low efficiency, and difficulty of complex ground object volume calculation in the process of traditional engineering operation, a volume calculation method based on lidar scanning technology is proposed in this paper. The point cloud data of space volume was obtained by UAV lidar scanning system, and the regular grid method was used to resample the point cloud and obtained the volume of space volume. Taking the vehicle as an example, collected the twice point cloud data of the ground and the vehicle, calculated the trajectory and coordinates, and the original data were pre-processed by using cloth simulation filter and resampled. The volume of surface vehicle was calculated by dividing regular grid and compared with the actual volume. The results showed that the volume errors were 6.989%, 1.937%, 0.190%, and 0.541% at the resampling spacing of 1 m, 0.5 m, 0.25 m, and 0.1 m, respectively. The calculation accuracy was the highest at 0.25 m resampling interval. The method has high efficiency and accuracy in calculating the volume of ground objects, and can realize the volume calculation of irregular ground objects, which provides a reference for related engineering applications.