The utility model provides an instrument is changed to general V type insulator which includes wing section fixture, two angle steel anchor clamps and telescoping device, the wing section fixture include the cassette, and the middle part of cassette is equipped with the draw -in groove, and the both ends of cassette are equipped with the pterygoid lamina that corresponds with two angle steel anchor clamps respectively, are equipped with down the connecting hole on the pterygoid lamina, the angle steel anchor clamps include the first splint and the second splint of vertical relative setting, and first splint upper end is equipped with horizontal locking screw, and first splint lower extreme is equipped with the connecting hole, and open second splint upper end has the through -hole with locking screw matched with, and locking screw is connected with lock nut after passing the through -hole, and second splint lower extreme is equipped with the horizontal board towards first splint, upward the connecting hole is located the below of horizontal board, the lower connecting hole fixed connection of the upper end of telescoping device and last connecting hole fixed connection, lower extreme and the pterygoid lamina of first splint. The utility model discloses can be applicable to the cross arm angle steel of different specifications.