External damage prevention device for power transmission line

The utility model discloses a power transmission line external damage prevention device, which comprises an upper concave plate and a lower concave plate, two sides of the lower concave plate are fixedly connected with connecting boxes, two sides of the bottom of the inner cavity of each connecting box are fixedly connected with first magnets, the tops of the first magnets are adsorbed with second magnets, the tops of the second magnets are fixedly connected with L-shaped plates, and the L-shaped plates are fixedly connected with the upper concave plate and the lower concave plate. One end of the L-shaped plate is fixedly connected to one side of an upper concave plate, a protection box is fixedly connected to the top of the upper concave plate, a vibration sensor is fixedly connected to the bottom of an inner cavity of the protection box, and a buzzer is fixedly connected to the left side of the bottom of the inner cavity of the protection box. Through the arrangement of the PLC, the vibration sensor, the bu