A device used for adding an insulating sleeve to a bare conductor comprises a fixed plate, a sliding plate, a pull line, and insulating sleeve and a guiding pipe. The fixed plate is connected with a first electric rod. The surface of the fixed plate is parallel to the first t electric rod. The fixed plate is provided with a slideway. The sliding plate is an L-shaped bent plate. Pulleys are arranged at the inner sides of two edges of the bent plate. The bent plate is arranged in an up-down inverted manner, wherein a vertical edge of the bent plate is embedded in the slideway. The pull line is wound in grooves of the two pulleys in sequence. One end of the pull line is connected with a traction mechanism on the ground, and the other end of the pull line is connected with the insulating sleeve. The insulating sleeve is provided with openings along the vertical direction. The guiding pipe is vertically arranged on a second electric rod. The inner wall of the guiding pipe is provided with a separating block used for separating the openings of the insulating sleeve. A top opening of the guiding tube is connected with the bare conducted in an abutted manner. According to the invention, the insulating sleeve can rapidly sleeve the periphery of the bare conductor, the device is convenient and practical, the safety accidents are reduced, the working efficiency is improved, and the labor intensity is lowered.