Lightweight and environment-friendly type fibrilia composite plate and preparation method thereof

The invention relates to a lightweight and environment-friendly type fibrilia composite plate and a preparation method thereof, belonging to the technical field of interior ornaments for automobile decoration. The composite plate comprises PE (polyethylene) film layers (1) and a fibrilia mat layer (2), wherein the fibrilia mat layer (2) is an intermediate layer, and the PE film layers (1) are compounded on the upper surface and lower surface of the fibrilia mat layer (2); and the fibrilia mat layer (2) is a needle-punched fibrilia mat, comprises 55-65% by weight of fibrilia and 35-45% by weight of PP (polypropylene) fiber, and is formed by mixing, forming a net and performing needle-punching. The method comprises the following steps of: (1) fibrilia processing: soaking the harvested fibrilia raw material in a hydrogen peroxide solution for 20-25 days, then washing with water, and further sequentially performing peeling, airing, opening, coiling and cutting off so as to produce a fibrilia crude product; and (2