The utility model provides a telescopic isolator goes up electrically conductive arm and changes instrument, including the flexible lead screw of two vertical settings, sliding fit's horizontal slide bar and cell type slider each other, the both ends of the upper surface of this cell type slider are equipped with respectively goes up staple bolt on the electrically conductive arm assorted with isolator, the lower part of cell type slider sets up to the spout and overlaps and is in on the horizontal slide bar, the both ends of horizontal slide bar are articulated one of them root of connecting respectively the one end of flexible lead screw, the other end of two flexible lead screws all be equipped with with isolator under electrically conductive arm assorted staple bolt. Utilize this change instrument, can simplify and be mechanical alignment and counterpoint in two dimensions going up in the electrically conductive arm change work complicated loaded down with trivial details manual operation to improved work efficiency greatly, reduced intensity of labour, reduced personnel and dropped into.