The invention relates to an insulating sleeve of a high-voltage fuse for a sulfur hexafluoride gas insulation switch cabinet, which comprises an insulator, cable accessories, an embedded screw sleeve,an initial terminal and a terminated terminal; the insulator, the embedded screw sleeve, the initial terminal and the terminated terminal are subjected to vacuum pouring of epoxy resin and then curedinto a whole; the outside of the integral structure has a cylindrical shape of which one end is a cone frustum, and an inner cavity has a shape that a cylinder and a cone frustum are transient; the initial terminal is provided with two screw contacts in a conical lug boss shape, which are formed by an insert with two screws up and down; and a middle part of the insert in the inner cavity is electrically and mechanically connected with a spring; the embedded screw sleeve is positioned at an end part of the cylinder of the inner cavity, and is electrically and mechanically connected with an insert of the terminated terminal; the outside of the terminated terminal has a conical boss shape; and the cable accessories have a cone frustum shape of which the bottom is provided with a circular flange, and the periphery of the circular flange is provided with mounting holes. The insulating sleeve has stable insulation, reliable seal, safe operation, flexible installation, small volume and wideapplication.