In-mold decoration forming method for automobile plastic parts

The invention relates to the technical field of plastic injection molding, in particular to an in-mold decoration molding method for automobile plastic parts, which comprises the following steps: firstly, mounting a movable mold base and a static mold base on an injection molding machine body, then starting a speed reducing motor to drive two rolling frames to be flush with a movable mold core at the same height, and then starting a stepping motor to drive a cam mechanism to move; the pressing plate is driven to press the decorative material belt, then the glue injection gun is started to inject hot-melt plastic into the movable mold core, the hot-melt plastic and the decorative material belt are fused into a whole, then the hydraulic rod is started to drive the ejector plate to eject the plastic part, and then the servo motor is started to drive the decorative material belt to move by a section for injection molding and decoration again. The decoration adding set is arranged in the movable mold base, a decor