The invention belongs to the field of high molecular materials, and particularly relates to a nanometer silicon dioxide modified polyphenyl ether material for automotive plastic parts. The nanometer silicon dioxide modified polyphenyl ether material is prepared from the following raw materials in parts by weight: 100 parts of polyphenyl ether, 6-9 parts of graphene, 4-6 parts of magnesium sulfate, 3-5 parts of stearic acid, 7-9 parts of dimethyl phthalate, 4-5 parts of dimethyl phosphite, 0.9-1.3 parts of ethylene-bis-stearamide, 3-4 parts of anilino-methyl-triethoxysilane, 4-6 parts of polyethylene wax, 1-2 parts of p-tert-pentylphenol, 6-9 parts of nanometer silicon dioxide and 12-15 parts of aids. The polyphenyl ether is modified by using the raw materials such as nanometer silicon dioxide, graphene and polyethylene wax, so that the processability and mechanical property of the polyphenyl ether are improved; and the prepared material has good rigidity, heat resistance, cold resistance, good electric property and wear resistance, is anti-static, firm and durable, safe and reliable to use, and the toughness of the prepared material is improved. The nanometer silicon dioxide modified polyphenyl ether material can be widely used for manufacturing various automotive plastic parts.