The invention discloses an automatic plastic molding machine, and belongs to the field of plastic processing. The automatic plastic molding machine consists of an injection device, a mold clamping device, a hydraulic system and a control system, wherein the injection device consists of a plasticizing component, a hopper, a charging barrel, a screw rod, a metering device, an injection cylinder and an injection base moving cylinder; the mold clamping device consists of a template, a draw bar, a mold clamping cylinder and an ejection cylinder; and the control system comprises a power control system, an action control system and a heating control system. By realizing the production process combined with a technology of the power control system, the action control system and the heating control system, the automatic plastic molding machine disclosed by the invention has the advantages of being capable of improving the product quality, appropriately reducing the operation technical level, improving the labor productivity, decreasing the number of substandard products, improving the size precision and the stability of products, improving the automating production process and saving the labor.