The utility model discloses an insulating maintenance device of high voltage?transmission lines, including running gear and patching device, running gear and patching device are articulated, and running gear rotates respectively in the pivot and connects a cantilever including locating the pulley on the high voltage?transmission lines, two cantilevers alternately downwards, and the bottom of cantilever is connected with two sliders I that are located the patching device bottom respectively, slider I is through removing about horizontal lead screw, the intersect of cantilever alternates to get up through the round pin axle, patching device includes suturing device and heating device, and suturing device includes linear guide, and linear guide's one end is equipped with slider II, is equipped with manipulator and manipulator connecting rod on the slider II, and one side of linear guide is equipped with heating device, and heating device establishes and is being used for the clamping cable to repair the parcel clip of piece, and the parcel clip reciprocates through the vertical screw bar who is located its bottom. The utility model discloses simple structure need not artifical the repair when repairing damaged high voltage?transmission lines, guaranteed safety, has improved repair efficiency.