The application relates to a plastic covering piece injection molding mold for a motorboat and an accelerated ejection structure thereof, which comprises a movable mold and a fixed mold, a ejector plate is slidably connected to the movable mold, an inclined ejector block is slidably connected to the movable mold, the inclined ejector block is connected to the ejector plate through a plurality of inclined rods, the accelerated ejection structure comprises an accelerated ejector rod, an accelerated inclined rod and an accelerated inclined guide block, the accelerated inclined guide block is slidably connected to the ejector plate along a direction perpendicular to an opening direction of the mold, the accelerated inclined rod is fixedly connected to the movable mold, the inclined rod is arranged along an inclined direction of the opening direction of the mold and is slidably connected to the accelerated inclined guide block, one end of the accelerated ejector rod is arranged along the opening direction of the mold and is slidably connected to the movable mold, and the other end of the accelerated ejector rod is slidably connected to the accelerated inclined guide block along an inclined direction of the opening direction of the mold. The conventional ejection movement of the ejector plate is converted into the inclined and axial composite accelerated movement of the accelerated ejector rod, so that the plastic part obtains a separation speed higher than the conventional ejection speed in the initial demolding stage, and a safe distance is provided in advance.