The invention discloses a method for modifying graphene suitable for a vinyl silicone oil material. The method comprises the following steps: ultrasonically dispersing graphene in xylene according tocertain mass parts, so as to form graphene slurry; adding absolute ethyl alcohol, ethylene triethoxysilane, gamma-Glycidoxypropyltrimethoxysilane, nonylphenol ethoxylate and polyol into the slurry, stirring, adding deionized water for adjusting the pH value, and stirring again; washing until the solution is neutral, and drying, so as to obtain the modified graphene. The preparation process is simple, the problem of dispersion of graphene in vinyl silicone oil is effectively solved, the purpose of uniform dispersion of graphene in the vinyl silicone oil is fulfilled, the modified graphene has very good stability and can be preserved for a long time, the electric conductivity and the thermal conductivity of graphene are brought into full play in the vinyl silicone oil material, and the modified graphene has strong practicability and wide applicability.