With the continuous development of plastic industry, people put forward higher demand for plastic parts. Injection mold also needs further optimization and innovation on the basis of different plastic parts. From the above analysis, we can see that China has made many achievements in the research of injection mold. At the same time, with the emergence of multi-color injection molding, low-pressure injection molding and multi-layer injection molding, there are also complex molds and multi cavity molds.