Abstract: This article develops a transmission line anti external force damage warning device based on TA induction power extraction technology, which realizes direct detection of the surrounding state of the line. It studies and develops a device that is directly installed on the transmission line and directly covers the area that needs protection, which meets the needs of transmission line safety protection. Its operation is not affected by tower tilting, vibration, swaying, and trees near the tower. The device obtains the working power through induction, making it not affected by continuous cloudy days. Compared to systems installed on towers with large areas of solar panels, this transmission line's anti external force damage warning device has a compact size, simple on-site installation, and can operate reliably for a long time.