The invention discloses a 500kV large-span support type tubular bus comprising tubular buses, wherein a support tube is arranged between every two tubular buses and is positioned in each tubular bus; and at least two circles of balls are arranged between each support tube and each section of tubular bus, and the support tubes are fixed at the upper ends of pillar insulators below the tubular buses through a fixing hardware tool. The 500kV large-span support type tubular bus has the advantages that: 1, the deflection of the large-span support type tubular bus meets the specified requirement under wind-free and ice-free conditions; 2, the support points of the tubular buses are articulated with each other so that the bending moments and the torques of the small pillar insulators can be reduced under various working conditions without adopting a bracket; and 3, the integral support tubular bus has simple structure and convenient installation. Eight flexible conducting wires of a telescopic connecting device are in a lantern shape so that the 500kV large-span support type tubular bus has strong corona resistance and radio interference resistance and good shielding performance, and a grading ring does not need to be arranged in the position; and in addition, the telescopic connecting device is integrally fixed by only one fixing hardware tool.