Abstract: In recent years, with the rapid development of society and economy, the hidden dangers of external construction of transmission line channels have increased significantly, and the pressure of management and control has also increased significantly. In order to effectively manage and control the hidden dangers of external construction, this paper designs an intelligent early warning device based on infrared detection laser technology. workload of maintenance personnel. The early warning device has been verified by on-site actual engineering and can meet the needs of on-site use. The design of the early warning device provides a feasible solution for the management and control of external hidden dangers of transmission lines, and has important reference significance.