The three dimensional reconstruction of transmission lines is one of the important tasks of power grid inspection.In this paper,a real time 3D reconstruction and data compression technology for transmission lines based on solid state LiDAR is proposed to automate circuit inspection.Firstly,the classic laser SLAM framework is improved according to the characteristics of solid state LiDAR by optimizing its feature extraction process and adding motion compensation,and the improved algorithm is used to model the transmission line in real time.Then,the improved fuzzy C means clustering method with weight factor is used to denoise the point cloud model to remove outliers and noises.Finally,in order to reduce the storage and transmission costs of large point cloud data,a time space coding method is designed to compress the transmission line model.The experimental results show that this method can achieve high precision real time modeling of transmission line scenes,and the compressed model can meet the storage and transmission requirements.