Abstract: During transmission line construction, challenges such as complex terrain in construction areas and work sites adjacent to energized lines are frequently encountered. These challenges threaten the safety of construction vehicles entering and leaving the site and the safe operation of nearby energized lines. Traditional measurement and control methods, such as theodolites and proximity voltage alarms, have low measurement efficiency, poor adaptability, and limited applicability when dealing with complex terrain and intricate positional relationships. The spatial panoramic perception early warning system integrates high-precision LiDAR sensing, multidimensional data fusion, and an audible and visual alarm system. It features strong environmental adaptability, fast response, and convenient installation, providing accurate topographic mapping and critical safety distance measurement and early warning for transmission line construction under complex terrain conditions.