The invention discloses a graphene material for asphalt modification as well as a preparation method and application. The graphene material for asphalt modification comprises partial oxidized graphenepowder and a surface grafting modifier. The preparation method of the graphene material for asphalt modification comprises the following steps: (1) partially oxidizing graphene powder to obtain partially oxidized graphene powder; (2) weighing a dispersion medium, the surface grafting modifier and the partially oxidized graphene powder; (3) uniformly stirring and mixing the dispersion medium withthe surface grafting modifier, adding the partially oxidized graphene powder, carrying out homogenization dispersion, and removing the dispersion medium to obtain the graphene material for asphalt modification. The invention further relates to the application of the graphene material for asphalt modification or the preparation method in medium asphalt and modified asphalt. When being applied to asphalt, the graphene material is capable of effectively improving the needle penetration, the softening point and the ductility of the asphalt.