Bio-based polysiloxane scratch-resistant auxiliary agent and preparation method thereof, and scratch-resistant composite material

The invention relates to the technical field of scratch resistance, and provides a bio-based polysiloxane scratch-resistant auxiliary agent and a preparation method thereof, and a scratch-resistant composite material. A green and renewable bio-based material derivative is utilized to carry out modification grafting on low-hydrogen-content polysiloxane, and the bio-based polysiloxane scratch-resistant auxiliary agent is designed and synthesized. When the bio-based polysiloxane scratch-resistant auxiliary agent is used for a scratch-resistant composite material, a main chain of the bio-based polysiloxane scratch-resistant auxiliary agent can migrate to the surface of the composite material to form a layer of lubricating film in a polymer base material forming process, so that the scratch resistance of the composite material is improved; and the side chain of the rigid benzene ring structure can endow the polymer base material with certain hardness and higher thermal performance, so that the scratch resistance a