The invention discloses a high-voltage power transmission line external force damage prevention monitoring device, which comprises front end equipment, a 3G (3rd generation) network and monitoring equipment, wherein the front end equipment is arranged on a power transmission line, the monitoring equipment is positioned in a monitoring room, the front end equipment comprises an image monitoring camera, a solar light absorption plate, a storage battery and 3G terminal equipment, the monitoring equipment comprises an image work station, a PC (personnel computer) work station and a short message calling device, the 3G terminal equipment of the front end equipment and the image work station of the monitoring equipment realize mutual communication through the 3G network, the image monitoring camera, the solar light absorption plate and the 3G terminal equipment are respectively connected with the storage battery, and the image work station and the short message calling device are respectively connected with the PC work station. The high-voltage power transmission line external force damage prevention monitoring device has the advantages that the remote real-time monitoring on the power transmission line is convenient, the work load of line operation personnel is reduced, and the like.