The invention relates to an automatic demould device of rotational injection machine, wherein it comprises a rotation disc, a fixing template, a lower rotation disc, a power device on the lower rotation disc, a group of connecting rods connected to the power device, a movable template connected to the connecting rods, a swing rod connected to the connecting rods, and a blower connected to the swing rod; said blower is formed by cylinder, piston inside the cylinder and the air needle fixed on the piston; when the air needle extrudes outside the air needle sleeve, it can injection mold the plastic element; and when the air needle is returned into air needle sleeve, the plastic element is shaded by the sleeve; therefore, the final plastic element will automatically drop, to avoid being adhered on the template. The invention has high working efficiency. |