The utility model relates to a steel tube tower butt-welded connection variable-slope node. One embodiment of the utility model uses a safe, reliable, economic and reasonable variable-slope node connection way in an AC 1000kV ultra high voltage double circuit lines on same tower. The steel tube tower butt-welded connection variable-slope node comprises: a connection plate; an upper segment of the steel pipe; a lower segment of the steel pipe; an upper reinforced plate and a lower reinforced plate, wherein the upper segment of the steel pipe is fixed on the connection plate, the lower segment of the steel pipe is fixed on the connection plate, the upper segment of the steel pipe is simultaneously fixed on the connection plate and the upper reinforced plate and the lower segment of the steel pipe is simultaneously fixed on the connection plate and the lower reinforced plate. According to one embodiment of the utility mode, one purpose is to build the high pressure iron tower, especially the alternative-current supper high voltage steel tube tower.