Wood-plastic composite doors are made by mixing ultra-fine wood powder and polymer resin through molding process. It has both the excellent characteristics of wood and plastic, and the products produced achieve the effect of real imitation wood. Since the raw materials used and the production process are not glued together, no harmful substances such as formaldehyde, benzene, ammonia, and trichloroethylene will be produced. It is a green and environmentally friendly new material that replaces traditional wood.