Benzoxazine prepreg composite and preparation method

The invention relates to a benzoxazine prepreg composite. The benzoxazine prepreg composite is composed of, by mass, 65-75% of benzoxazine resin, 5-20% of epoxy resin and 5-15% of flexibilizer. By means of the technical scheme, through benzoxazine compound components with at least one monofunctional/polyfunctional group, by adding the epoxy resin not limited to one type, processing properties are improved, and the binding force of benzoxazine resin base bodies and fiber is enhanced; the flexibilizer is selected from at least one type of flexibilizer, the rigidity of the benzoxazine resin base bodies is improved, and therefore fiber/fabric produced and impregnated through the benzoxazine resin base bodies has high manufacturability, and the benzoxazine prepreg composite long in room temperature storage life and high in performance is obtained.