Abstract: Aimed at the requirement for thermosetting plastic injection molding process, a two-plate pressure injection mould with a layout of one mold and two cavities was designed. An edge type gate was designed as the sprue gate, and a column was used to perform pressure-injection, where the injection pressure was controlled in the range of 7~32 MPa. The injection chamber was heated by an electric heating system, and the molding parts were heated by using FYD350 heat conduction oil. The temperatures of the upper die inserts and lower mould inserts were controlled in the ranges of 153~156 ℃ and 148~151 ℃, respectively. Three kinds of exhaust modes were adopted to exhaust the cavity. According to the characteristics of side holes, three side-core pulling slider mechanisms were designed to demould the die, and a two-sided pin resetting mechanism was designed to reset the ejecting mechanism earlier. The design of this mould structure is reasonable, and its mechanism designed by this work is simple. Such a design can be used as a reference for the design of injection molds of similar plastic parts.