In the background of national advocacy of the elimination of backward production capacity, new requirements are raised on car parts production. With the rapid development of automobile industry in our country, a new type of high efficient molding equipment was designed for automobile sound insulation pad production to meet the market demands. The working principle and characteristics of the designed hydraulic control system, which was used in the latest molding machine for automobile sound insulation pad, were analyzed. With the charging valve and the proportional directional valve as main components, the differential circuit was designed to improve the speed of cylinder.