Three-phase change-over switch used for GIS product test butt joint

The utility model relates to a three-phase change-over switch used for GIS product test butt joint, which comprises a moving side and a static side, wherein the moving side is connected with a high-voltage testing device, and leads high voltage to a high-voltage contact part through a conductor; the static side is connected with a GIS product; the three-phase change-over switch is characterized in that: the static side is provided with three contact fingers which are distributed with the included angle of 120 degrees and positioned on a same circumference and respectively connected with A, B and C three-phase branch buses of the GIS product; the high-voltage contact part is provided with a converting conductor with the front end being a high-voltage contact, and the converting conductor moves relative to the circumference where the contact fingers are positioned by a drive mechanism so as to lead the high-voltage contact to be respectively and elastically connected with one of the three contact fingers; and t