The invention discloses a telephone line or electric wire processing method, which includes the following steps: 1) two opposite knife blades are arranged, the adjacent sides of the blades closely cling to each other in closure and a telephone line or electric wire including four strands of tiny threads is caused to be perpendicular to the knife blades and positioned between the two knife blades;2) when the two knife blades move oppositely, the sheath of the telephone line or the electric wire is cut off in the first stage; and 3) the two blades keep on moving oppositely to cut off the two strands of tiny threads in the middle of the telephone line or the electric wire. The invention also discloses knife blades for implementing the telephone line or electric wire processing method. The knife blade comprises a blade body, the front face of which is provided with a sunken part in the middle part; the middle part of the sunken part is provided with a triangular heave; the bottoms of twosymmetrical recess areas partitioned by the triangular heave are provided with two square heaves; the triangular heave is lower than the front face of the blade body; and the square heave is lower than the triangular heave. The invention can reduce the quantity of workers required by production, improve production efficiency, lessen the difficulty of subsequent production process and guarantee thequality of products.