The invention discloses a composite material for automobile interior trims, and a preparation method and application thereof. The composite material for automobile interior trims is composed of the following raw materials in parts by weight: 27-35 parts of alkyd resin, 33-41 parts of polymethyl methacrylate, 3-7 parts of ethylene propylene diene monomer rubber, 11-19 parts of potassium persulfate, 14-22 parts of calcium hydrogen succinate and 1-5 parts of graphene. The preparation method comprises the following steps: grinding the alkyd resin and graphene, adding into the potassium persulfate solution, and heating and stirring to obtain a mixture A; mixing and grinding the polymethyl methacrylate and ethylene propylene diene monomer rubber, adding into the calcium hydrogen succinate solution, and carrying out ultrasonic treatment to obtain a mixture B; and carrying out mixing ultrasonic treatment on the mixture A and mixture B, heating and stirring, extruding, and granulating. The special composite material for automobile interior trims can effectively decompose organic small molecules and greatly lower the VOC (volatile organic compound) content, and has the function of automatically purifying VOCs. The preparation method has the advantages of simple preparation technique and low cost, is easy to operate, and is suitable for industrial production.