Injection mold and manufacturing method thereof

The invention relates to the technical field of injection molds, in particular to an injection mold and a manufacturing method of the injection mold, the injection mold comprises an outer mold and an inner mold slidably connected in the outer mold, and mold grooves are formed in the upper, lower, left and right parts of the inner mold. The invention discloses a manufacturing method of an injection mold. The method comprises the following steps: S1, manufacturing blanks of an outer mold and an inner mold by utilizing a casting process; s2, the four inner walls of the outer mold are milled to be flat through a milling machine, and meanwhile four mold grooves of the inner mold are milled to be flat through the milling machine; s3, the four inner walls of the outer mold and the four mold grooves of the inner mold are polished to be smooth and free of burrs; s4, the outer mold and the inner mold are inspected, the outer mold and the inner mold which are inspected to be qualified are installed, and the unqualified