The invention discloses a composite material comprising a low-cost high-efficiency broad-spectrum antibacterial polypropylene functional master batch and a preparation method thereof. The composite material is prepared from the following raw materials in parts by weight: 5-10 parts of antibacterial functional master batch, 48-93 parts of conventional polypropylene, 0-40 parts of inorganic filler, 8-20 parts of elastomer, 0.1-1 part of antioxidant and 0-3 parts of other aids. The technical scheme of the invention reduces the influence of heavy addition of the antibacterial agent on other properties of the material on the premise of lowering the material cost. The prepared antibacterial polypropylene composite material has the characteristics of high efficiency, broad antibacterial spectrum, favorable mechanical properties and the like.