The invention discloses a cable stripping device and a stripping method. The cable stripping device comprises a base, a support seat, a rotary table and a cable stripper, wherein the support seat is fixed at the top of the base, the support seat is provided with the cable stripper that is perpendicular to the support seat and can rotate, a cable support is arranged inside the cable stripper, the rotary table is fixed at one end outside the cable stripper, and a transverse cutting knife and a longitudinal cutting knife that are perpendicular to each other are arranged at the other end at a certain deflection angle. Both the transverse cutting knife and the longitudinal cutting knife are arranged on the cable stripper, so that the outer skin of the cable is cut circularly and longitudinally so as to be removed, the cable core is not damaged, and the working efficiency is improved.