Wiring cutter capable of being used in combined mode

The wiring cutter comprises a first cutter, a second cutter and a third cutter, the third cutter is arranged above the second cutter, a through groove is formed in the middle of the upper portion of the first cutter and wraps the second cutter, and the upper end face of the through groove and the lower end face of the third cutter are located on the same plane. An arc-shaped through groove is formed in the lower end face of the second cutter and matched with the through groove. At present, the electric melting pipe fitting has the characteristics of reducing the influence of external environment and human factors in the construction process to the greatest extent and the like, and is better in reliability, so that the electric melting pipe fitting plays an important and different alternative role in engineering and maintenance. The electric melting pipe fitting is used as a connecting fitting of a pipe, resistance wires need to be buried at the connecting position of the electric melting pipe fitting and the