The invention provides a method for preparing a novel engine dust cover plate. The novel engine dust cover plate comprises a main cover plate and side cover plates, wherein the main cover plate comprises a soundproof chamber and cavities, the soundproof chamber is formed in the middle of the main cover plate, the cavities are formed at the two ends of the soundproof chamber, the side cover platesare installed in the cavities, one end of each side cover plate connected with the corresponding cavity is provided with a limiting plate, and each side cover plate is made up of sub-plates connectedthrough connectors. As for the novel engine dust cover plate, as the sound soundproof chamber is formed in the middle of the main cover plate through the structural connection between partitions, on the one hand, the soundproof chamber can appropriately block the noise emitted by the engine, and on the other hand, the soundproof chamber makes the thickness of the main shell plate have a place forheat dissipation; as the cavities are formed at the two ends of the main cover plate, side cover plates made up of the connected sub-plates are arranged in the cavities, and meanwhile vent holes are formed in and dust screens are arranged on the side cover plates, the internal air convection is realized, the cooling effect is good, and a certain amount of dust can be effectively blocked by the screens.