The invention belongs to the field of functional materials and in particular relates to a sound absorption rubber composite material and a preparation method thereof. The composite material comprises the following raw materials in percentage by weight: 1%-4% of potassium feldspar, 1%-4% of zinc oxide, 0.5%-0.8% of sulfur, 1%-3% of stearic acid, 18%-21% of a polypropylene gypsum mixture, 0.1%-0.3% of an accelerator 2,2'-dithiodibenzosuberol, 3%-6% of carbon black and the balance of isoprene rubber. According to the preparation method, rare and expensive materials are not used, the cost of the used raw materials is reduced, wastes are adopted as the raw materials, and the preparation process is simple and convenient; the prepared material can be applied in the fields of transportation, buildings, military affairs and the like, and has the effects of shock prevention, impact absorption, heat insulation, sound insulation and the like.