The utility model relates to an outdoor high -tension voltage tower, including the pylon, be equipped with a plurality of high -voltage line support element on the pylon, high -voltage line support element is equipped with high -voltage line coupling mechanism including fixing the transverse fixing plate on the pylon in transverse fixing plate's both sides, high -voltage line coupling mechanism is equipped with the perforation including fixed cover fixed sheatheeing in, the fixed connection of after section sliding plate of connecting non -conductive support rod, non -conductive support rod of sheatheeing in, transverse fixing plate passes through elastic buffering mechanism and is connected with the pylon, and elastic buffering mechanism is including setting up at two support piece below the transverse fixing plate and the springiness cushioning spare above being located transverse fixing plate, and two support piece are located the both sides of pylon respectively. Ascending pulling force is applyed through self elasticity to transverse fixing plate to springiness cushioning spare, guarantees that transverse fixing plate in certain extent is crooked, can not break because crooked degree is too big, has strengthened high -tension voltage tower's life.