Replacement tool

The invention provides a replacement tool which is used for replacing a strain insulator string in a live-line manner. The tool comprises a clamp comprising a front clamping piece, a rear clamping piece and two extension rods connected between the front clamping piece and the rear clamping piece, and an insulator cradle used for supporting the strain insulator string, wherein the front clamping piece and the rear clamping piece are respectively and detachably clamped at a front fixed end and a rear fixed end of the strain insulator string, the front clamping piece is also provided with a penetration piece, one end of the insulator cradle is hinged with the rear clamping piece, and the other end of the insulator cradle can be controlled to extend into or out of the penetration piece, when the tension insulator string is disconnected with the front fixed end, the other end of the insulator cradle extends out of the penetration piece, and the insulator cradle supports the tension insulator string and can be cont