The invention discloses an insulated wire which belongs to a power material used in the field of power transmission. The insulated wire comprises a metal wire core and a protective layer wrapped on an outer layer of the metal wire core, wherein the protective layer sequentially comprises an insulating rubber layer, a polyurethane fiber layer and an insulating paint layer from inside to outside; and the polyurethane fiber layer is polyurethane fiber cloth knitted by polyurethane fibers. According to the insulated wire, the insulating rubber layer, the polyurethane fiber layer and the insulating paint layer are sequentially arranged on the surface of the metal wire core from inside to outside, so that the weather resistance and an insulating property of the insulated wire are greatly improved, and the service life of the insulated wire is further prolonged.