The invention discloses an overhead ground wire lifting mechanism which comprises a lead screw, a screw nut, a sleeve and a hook. The upper end of the screw nut is provided with a U-shaped notch, two side walls of the U-shaped notch are provided with bolt clearing holes, the hook is made of an epoxy resin plate, the hook is connected with the lead screw through a bolt, the screw nut is installed on the lead screw in a rotating mode, the sleeve is installed on the lead screw in a sleeved mode, and the sleeve is arranged on the upper portion of the screw nut. The sleeve is provided with an overhead ground wire supporting hook, the screw nut is provided with a stress application handle, and the hook is hung on an overhead ground wire hanging cross arm. The overhead ground wire supporting hook supports an overhead ground wire, the stress application handle is rotated, and then the screw nut dives the sleeve to move upwards. The overhead ground wire supporting hook on the sleeve drives a ground wire to move upwards together, and therefore charged replacement of a straight overhead ground wire armour clamp can be achieved. Compared with the prior art, the overhead ground wire lifting mechanism solves the problems that in the working method of piggyback of the prior art, reliability is poor, potential safety hazard exists, and labor intensity of operators is high. In addition, the overhead ground wire lifting mechanism is applied to both a channel steel cross arm and an angle steel cross arm.