The invention relates to a PS (polystyrene) composite material. The PS composite material comprises, by weight, 80-100 parts of PS, 20-30 parts of acrylate rubber, 3-5 parts of phenolic resin, 10-16 parts of mica powder, 10-14 parts of vermiculite, 0.1-0.5 part of antioxidant and 0.1-0.3 part of lubricant. The PS composite material has the advantages that the acrylate rubber has a small particle size and a large specific surface area, and the interface adhesion strength between a PS resin matrix and filling particles is high; the proportion of an interface region is increased through increaseof the specific surface area of the particles, and some movement units of the PS resin matrix are increased, such as constraints on rearrangement movements of chain segments and the like; vibration ofsound waves in the PS composite material needs to overcome greater resistance, and accordingly, the noise reduction performance is improved.