Abstract: The present invention relates to a method for manufacturing a composite molded body, and more particularly, to a method for manufacturing a composite molded body, comprising: a step of manufacturing a molded body containing polyethylene terephthalate, acrylonitrile-butadiene-styrene, and glass or carbon fibers; and a step of coating the molded body with a reactive polyurethane composition or with a rubber composition. The composite molded body according to the present invention can be used in lieu of a wheel hub casting to minimize the weight of a wheel, can be manufactured at a low cost in terms of materials, and can be mass-produced. The composite molded body of the present invention has remarkably superior adhesion to the coating composition, and the strength and durability thereof corresponds to that of cast metal such as cast iron, stainless steel, aluminum, etc.