The invention discloses a manufacturing process of a wiring terminal with a large-size contact plane of an electric control system of a new energy automobile. The process comprises the steps of (1) blanking; (2) annealing; (3) preparing blanket; (4) oxidizing the surface; (5) lubricating the surface; (6) forwards extruding; (7) closing and forming; (8) machining; (9) electrosilvering; (10) passivating. According to the process, the closing forming type plastic molding technology is applied to the manufacturing of the wiring terminal of the electric control system of the new energy automobile and mainly used for forming a main body part of the large-size contact area of the wiring terminal of the electric control system of the new energy automobile; therefore, the diameter of the production raw materials, namely, copper bars can be reduced, the subsequent cutting processing can be decreased, a large amount of copper resources can be saved, and moreover, the processing process is simple; a metal flow line of the materials is complete; the product in stable in quality, high in internal structure density and high in comprehensive mechanical performance; the production efficiency is increased; the requirement on precision can be met, and the manufacturing cost can be decreased.