The invention discloses an insulation sheath mounting tool. The insulation sheath mounting tool is used for mounting an insulation sheath, wherein the insulation sheath comprises a jack and a needle,the needle is inserted from one end of the jack and stretches out from the other end of the jack, a left clamping rod and a right clamping rod are comprised, the left clamping rod and the right clamping rod cross and are connected through a rotation shaft b, the left clamping rod comprises a handle and a left clamping head, the right clamping rod comprises a handle and a right clamping head, the left clamping head and the right clamping head are U-shaped structures, U-shaped openings of the right and left clamping heads are opposite, one ends of the left clamping head and the right clamping head are connected with the two handles, and the other ends are connected with a left pressing head and a right pressing head. The tool is advantaged in that a snap fastener of the insulation sheath ismade to more simply and conveniently mount, a problem of electric shock risk of an operator caused by damage to an insulation glove by a sharp point at a front end of the pressed snap fastener duringmanual pressing can be prevented, and work efficiency is improved.