The invention discloses an ejection device of an injection mold. The ejection device of the injection mold comprises a workbench, wherein supporting legs are fixedly connected to the four opposite angles of the workbench, the tops of the four supporting legs are fixedly connected with the same top plate, a driving motor is fixedly connected to the bottom of the workbench, the output end of the driving motor is fixedly connected with a driving shaft, and the driving shaft penetrates through the workbench and is fixedly connected with a bottom plate. Through cooperative use of the driving motor, the driving shaft, a floor, supporting rods, a bottom mold, a mounting opening, a rotating plate, an air cylinder, a telescopic rod, a fixing plate, an ejector pin, an ejector opening and a connecting plate, injection molding materials can be evenly fed, and then materials can be evenly stored in the bottom mold; and meanwhile through cooperative use of the air cylinder, the telescopic rod, the connecting plate and the fixing plate, rapid and automatic ejection of the injection mold is achieved, the problem that in a traditional device, demolding of an injection mold is achieved in a manual ejection mode is solved, and labor is saved.