The invention provides a power transmission and transformation line wire hanging device, which comprises a bottom plate. A fixing mechanism is arranged below the bottom plate; a sliding rail is arranged on the bottom plate; a slidable sliding block is arranged on the sliding rail; a supporting plate is arranged on the sliding block; a nut seat is fixedly connected below the supporting plate; one side of the bottom plate is provided with a screw rod driving mechanism; a first wire clamping mechanism is arranged on the supporting plate; and a second wire clamping mechanism is arranged on the bottom plate. The structure is simple, control on the wire by a worker in the air is facilitated, the wire can be accurately inserted to an insulator groove, the wire hanging efficiency is improved, and the labor intensity is reduced.