Injection mold processing is to first add plastic into the mold, then the mold is continuously rotated along two vertical axes and heated. Under the action of gravity and heat energy, the plastic in the mold is gradually and evenly coated, melted and adhered to the entire surface of the mold cavity, formed into the required shape, and cooled and shaped. In addition, the rotational molding process only requires the strength of the frame to be sufficient to support the weight of the material, the mold and the frame itself to prevent the closing force of the material from leaking; and the material is almost not affected by any external force except the effect of natural gravity during the entire molding process, thus fully possessing the advantages of convenient machine mold processing and manufacturing, short cycle and low cost. At the same time, injection molding is a process developed based on micro-manufacturing technology, and of course there are many other methods.