The invention provides a preparation method of continuous glass fiber/nylon composite and the application of the continuous glass fiber/nylon composite at the aspects of the aerospace, the military industry, vehicles, architecture, furniture and the like. High-flow nylon and mixture of the high-flow nylon serve as basic materials, continuous glass fibers serve as reinforcing materials, antioxidants and the like are added at the same time, and the novel thermoplastic composite is prepared. The continuous glass fiber/nylon composite has the advantages of high strength and high gloss, is ideal substitute materials for steel materials, and can be used for preparing components such as a cover plate of a car engine, a cover plate of a trunk, a building template, furniture plates, and a framework of a seat chair.