The utility model discloses a circular cutting sword for getting rid of insulating skin of copper core, a canning section of thick bamboo, conduit and sun gear, both ends are sealed about telescopic, and it is inside by partitions are divided into left side cavity and right cavity. The conduit is located the sleeve, and the left end stretches out the telescopic outside, and its right -hand member stretches out the right side wall of baffle, and the outside that the conduit is close to the right -hand member is provided with the support, installs the laser cutting head on the support, and the laser cutting head is located the right -hand member outside of conduit, and the laser emission of laser cutting head holds the axis towards the conduit. The conduit is coaxial with the sleeve, and sun gear overlaps the part that is located left cavity at the conduit, and the conduit rotates along with sun gear. Sun gear and the initiative gear engagement who lies in its one side, the driving gear is by installing the servo motor drive in left cavity. The utility model discloses make the incision of the insulating skin after the processing neatly, beautifully, not hinder the sinle silk, laborsaving fast, safe and reliable has shortened the electric power construction time, has improved production efficiency.