The invention discloses an overhead bare cable automatic wrapping robot comprising a frame provided with at least two layers of cross beams in the vertical direction the longitudinal beam is fixedly connected with the cross beam at the uppermost end of the frame, and the longitudinal beam is provided with a feeding mechanism and at least two walking mechanisms installed on the same side of the feeding mechanism for automatically moving the overhead bare cable automatic wrapping robot on the cable; The cross beam at the bottom of the frame is provided with an entrance end for the cable to enter; A lifting mechanism is fixedly installed on the cross beam at the bottom layer of the frame, and a fastening mechanism is installed on the lifting mechanism between the walking mechanisms for placing the cables and wrapping the insulating sheath on the cables; A feed support mechanism is mounted on a longitudinal beam between a waling mechanism adjacent to the feeding mechanism and a fastening mechanism.