The invention discloses a wiring harness automatic needle welding system of a full-automatic wiring harness processing and assembling apparatus. The wiring harness automatic needle welding system of the full-automatic wiring harness processing and assembling apparatus is characterized in that a circular workbench, a needle feeding mechanism, a tin feeding mechanism and a soldering motion mechanismare arranged on the rack. The circular workbench is arranged in a rotatable manner. A plurality of carriers are evenly arranged on the circular workbench in the circumferential manner. A positioninghole used for fixedly placed a copper needle into is formed in the center of each carrier. The needle feeding mechanism, the tin feeding mechanism and the soldering motion mechanism are arranged on the outer circle of the circular workbench and are arranged corresponding to the carriers on the circular workbench. The wiring harness automatic needle welding system of full-automatic wiring harness processing and assembling apparatus has the advantages that because the scheme mentioned above is adopted, automatic soldering motion of the end of wiring harness can be achieved, full-automatic production of wiring harness machining and assembly can be achieved, the working efficiency is improved, and the manual cost is reduced.