The utility model discloses a core structure of a three-way pipe injection mold and belongs to the technical field of injection molds. The three-way pipe injection mold comprises a main core, a matching core I and a matching core II, wherein the main core is sleeved with an insert; the end socket of one end of the main core is designed to be a smooth conical chamfer; the end socket of one end of each of the matching core I and the matching core II is designed to be an inclined chamfer; the inclined chamfers are matched with the conical chamfers. According to the core structure of the three-way pipe injection mold, one end of the main core, one end of the matching core I and one end of the matching core II, which are connected with one another, are respectively designed to be the chamfers, so that connection fusion of the three cores is facilitated, and the phenomenon that the appearance and the quality of a product are affected by excessive burrs is avoided; furthermore, the service lives of the cores are prolonged; moreover, a bulge is arranged on the insert, so that the insert can be clamped by a manipulator during operation; therefore, the convenience in mounting the insert by the manipulator is enhanced, the production efficiency is improved, the labor cost is reduced, and the economical benefit is improved.