The utility model relates to a transmission line marking device and tower position mark device, concretely a transmission line marking device based on GPS positioning technology. The transmission line marking device comprises a GPS satellite positioning module, a GPS receiving module and a ground calibration computer solidified with a GoogleEarth module, wherein the ground calibration computer is connected with the GPS receiving module, the ground calibration computer receives the tower position coordinate, altitude, longitude and latitude and direction data collected by the GPS receiving module, and the transmission line and the tower connection-line track are displayed on the GoogleEarth module. The real-time route and the geographic position are displayed on the GoogleEarth module with high resolution topographic map in the ground calibration device, and the construction route is subject to accurate positioning and real-time navigation, and the environment and the road situations around the tower are displayed, thus the tower position searching process is more convenient, the construction efficiency is improved, and the manpower and material resources are saved.