Cable connecting piece and connecting method

The invention discloses a cable connecting piece and a connecting method, and the cable connecting piece comprises two outer pipe fittings which are in butt joint with each other, and a connecting disc which is assembled between the two outer pipe fittings and is located at the inner sides of the outer pipe fittings, a plurality of imbedding holes are annularly distributed in the disc surface of the connecting disc, and a cable fixing device is matched through the imbedding holes. A wire harness is assembled through the wire fixing device, the wire harness penetrates through the wire fixing device, and the part, located outside the wire fixing device, of the wire harness is a spiral part; and end covers are installed at the two ends of the outer pipe fitting, movable fixing devices used for fixing cables are inserted in the axes of the end covers in a penetrating mode, cable cores of the cables are in butt joint with wire harnesses, and the butt joint positions are wrapped with insulating tape. The device can