The invention relates to an electric transmission line high-altitude work platform, and belongs to the technical field of devices special for electric transmission line overhauling. The electric transmission line high-altitude work platform comprises two hanging ladders special for electric transmission line overhauling, an H-shaped slide rail is utilized to connect the two hanging ladders, a connecting and fixing device is arranged in a connector, a special pulley is placed on the H-shaped slide rail, elastic steel sheets are installed on ladder hooks of the hanging ladders and are used for fixing the whole platform, and safety protection devices for preventing unhooking are arranged on ladder hook openings of the hanging ladders and the pulleys. The electric transmission line high-altitude work platform is reasonable in structural design, fast to install and dismantle, convenient to transport and firm, light, safe and reliable.