Medical biomaterial with high toughness and high surface hardness, and preparation method thereof

The invention discloses a medical biomaterial with high toughness and high surface hardness, and a preparation method thereof. Polymethyl methacrylate, high density polyvinyl chloride and ethylene glycol dimethacrylate are adopted as main components, poly-3-hydroxybutyrate, an ethylene-octene copolymer, pentaerythritol oleate, coconut oil fatty acid monoethanolamide, polyphenylene sulfide, ethyl chrysanthemumate, chitin fibers, zeolite powder, magnesium sulfate, hexyl ester of epoxidized soybean oil, a dispersant and a stabilizer are added, and mixing stirring, high temperature sintering, crushing, high pressure calcination, acid leaching, ultrasonic dispersion, screw extrusion and injection molding treatment are carried out to prepare the medical biomaterial. The toughness and the surface hardness of the medical biomaterial with high toughness and high surface hardness meet needs of practical applications in order to meet the requirements of the industry, so the medical biomaterial has good application prosp