The invention provides a polypropylene composite foamed material which is prepared from the following raw materials in parts by weight: 75-85 parts of polypropylene, 5-10 parts of carbon fibers, 2-5 parts of a foaming agent, 3-4 parts of a nucleating agent, 1-2 parts of a coupling agent, 0.6-1 part of zinc oxide, 0.6-1.2 parts of zinc stearate and 2-4 parts of polyethylene wax. According to the polypropylene composite foaming material provided by the invention, carbon fibers through surface treatment and polypropylene are combined as a supporting framework in the foamed polypropylene material,so that the mechanical property of the polypropylene foamed material can be improved. The invention also provides a preparation method of the polypropylene composite foamed material.