The function of the automobile wiring harness is the basic carrier of the internal communication of the automobile. The automobile wiring harness is the main body of the network of the automobile circuit. It connects the electrical and electronic components of the automobile and makes it function. Without the wiring harness, there is no automobile circuit. The automobile wiring harness is a component that is formed by bundling the wire harness to form a connection circuit after the contact terminal is punched out of copper and the wire and cable is crimped, and then an insulator or a metal shell is added on the outside. At present, whether it is a high-end luxury car or an economical ordinary car, the form of wiring harness is basically the same, which is composed of wires, connectors and wrapping tapes, which not only ensure the transmission of electrical signals, but also ensure the reliability of the connection circuit. It can supply the specified current value to the electronic and electrical components, prevent electromagnetic interference to the surrounding circuits, and eliminate electrical short-circuits.