NOVELTY - Preparing one-dimensional nanocomposite material comprises: (a) spin coating procedure; (b) solution preparation procedure: preparing the precise metal salt into the solution of 0.0019-0.007 mol/L at the room temperature; (c) procedure for preparing the composite materials; and (d) washing and drying procedures: taking out the copper sheet and washing with the deionized water and then airing it naturally to get the composite material of the one-dimensional nanomaterial and the precise metal nanoparticles.    USE - The method is useful for preparing one-dimensional nanocomposite material (claimed). The one-dimensional nanocomposite material is useful as electrode materials of heterogeneous catalyzing, electrical catalyzing and fuel battery.    ADVANTAGE - Compared with the current technology, the invention is featured by simple and controllable method, short flow, easy operation as well as strong reproducibility and can be broadly used; the product produced by the invention has the advantages of high purity, uniform particle diameter of the precise metal particle, high load ratio, good activity, excellent electrical conductivity, larger electro-active surface as well as higher electro-catalytic activity and is not easy to gather.    DETAILED DESCRIPTION - Preparing one-dimensional nanocomposite material comprises: (a) spin coating procedure: coating the dispersion liquid of the one-dimensional nanocomposite material on a copper sheet in a spinning manner with the coating density of 0.004-0.04 g/cm2; (b) solution preparation procedure: preparing the precise metal salt into the solution of 0.0019-0.007 mol/L at the room temperature; (c) procedure for preparing the composite materials: putting the copper sheet handled by the spin coating into the prepared solution and steeping it for 1-30 minutes; and (d) washing and drying procedures: taking out the copper sheet and washing with the deionized water and then airing it naturally to get the composite material of the one-dimensional nanomaterial and the precise metal nanoparticles.