Polypropylene self-reinforced composite material and preparation method thereof

The invention relates to a polypropylene self-reinforced composite material and a preparation method thereof. The polypropylene self-reinforced composite material has the characteristics of high tensile strength and high bending strength. The polypropylene self-reinforced composite material comprises a first material layer, a second material layer and a middle interlayer stacked between the first material layer and the second material layer, the middle interlayer is a polypropylene fabric formed by weaving in a plain weave, twill weave, satin weave or three-dimensional mode, and the polypropylene fabric comprises a surface layer and a base layer. The base layer comprises a base material and a modified carbon fiber composition, the first material layer, the second material layer and the surface layer are all low-melting-point polypropylene, and the base material is high-melting-point polypropylene; wherein the weight ratio of the base material to the modified carbon fiber composition is (0.89-0.91): (1.5-2), t