The invention discloses a method for manufacturing an engine ignition switch. First an injection mold used for molding a pedestal is mounted on an injection molding machine, an integrated backflow strip assembly is used as inserts to be put in the injection mold, the backflow strip assembly includes a plurality of backflow strips having wiring terminals and connecting parts connected among the backflow strips; at this moment, the injection module starts injection molding, thereby obtaining a semi-finished product including the pedestal having a connecting jack and the backflow strip assembly embedded in the pedestal, and each wiring terminal is located in the connecting jack of the pedestal; then the semi-finished product is placed on a lower die of a punching die and a punch press is started, and an upper die of the punching die moves down, i.e., welding jacks can be obtained by punching in positions corresponding to the connecting parts on the semi-finished product; and pins of a resistor are inserted in the corresponding welding jacks, so that the pins in the welding jacks and the corresponding connecting parts are welded together to form a complete finished product. The methodprovided by the invention can improve production efficiency, reduce labor cost, and facilitate improvement of product quality at the same time.