The invention relates to an embedded piece injection molding structure. The embedded piece injection molding structure comprises a fixed mold and a movable mold; the fixed mold includes a fixed mold body and a slide block component; the slide block component is matched with the fixed mold body; the fixed mold body is provided with a molding cavity matched with an embedded piece; the slide block component is used for fixing the embedded piece when the fixed mold and the movable mold are opened; the movable mold includes a movable mold body, an elastic block component and a wedge block; the elastic block component and the wedge block are fixedly spaced on the movable mold body; and the elastic block component is used for fixing the embedded piece when the fixed mold and the movable mold are closed. The embedded piece injection molding structure aims to solve the technical problems of easy looseness, deviation and falling out of the mold cavity of the embedded piece in the embedded piece injection molding structure in the prior art.