The invention provides a mounting system of an interval rod for an overhead bus in an extra-high-tension transformer station. The mounting system comprises traction devices, turning pulleys, traction cables, a carrying cable, chain hoists for adjusting the sag of the carrying cable, carrying pulleys for supporting the traction cables during traction, connection tools mounted on an extra-high-tension transformer station structure and used for mounting the carrying pulleys and connecting the carrying cable, and a traction electric manned coaster. The mounting system helps to solve a conventional electric coaster is poor in climbing capability, and is higher in efficiency than the conventional electric coaster. Construction workers can reach designated places to mount interval rods by taking the traction electric manned coaster, the construction quality is well guaranteed, and mounting problems of interval rods for a 1000kV extra-high-tension transformer station overhead bus during diameter expanding of leads are solved economically.