The invention discloses a copper and aluminum couple corrosion preventing aluminum and aluminium alloy wire harness and a preparation method thereof. The technical problems that an existing copper and aluminium terminal manufacturing procedure is complex, the input is large and the efficiency is low are solved. The aluminum and aluminium alloy wire harness comprises a copper terminal, an aluminium pipe and a cable, the cable comprises an insulating layer and a conductor, the conductor is wrapped by the insulating layer, one end of the conductor stretches out of the insulating layer to form a peeling head, the aluminium pipe is connected to the peeling head in a sleeving mode and is in compression connection with the peeling head, the outer end of the aluminum pipe is flush with the outer end of the peeling head, and the outer end of the copper terminal and the outer end of the aluminum pipe are connected with the outer end of the peeling head. Accordingly, copper rod forging and pressing and aluminium rod turning and milling are not needed while the advantage of preventing copper and aluminum couple corrosion through friction welding can be reserved, the procedure and equipment input are reduced, the cost is lowered, and the overall price advantage of the aluminum and aluminium alloy wire harness price is increased.