The invention provides a method for preparing tungsten carbide wear-resistance coatings by tungsten waste materials, which comprises the following steps that: the tungsten waste materials are used as raw materials for preparing tungsten oxide powder, the tungsten oxide powder is added into organic solvents to be uniformly mixed, reaction residues are removed through filtering, light yellow tungsten oxide sol is prepared, the tungsten oxide sol is heated and is stirred to be evaporated, tungsten oxide gel is prepared after the concentration, a lifting film coating method is used for lifting film forming on the surface of hard alloy, tungsten oxide coatings are prepared, drying and cooling are carried out, the hard alloy coated with tungsten oxide nanometer films is prepared, the hard alloycoated with the tungsten oxide nanometer films is placed into a reducing furnace introduced with reducing gas for carbonization, and the tungsten carbide wear-resistance coatings coated on the surfaces of the hard alloy are prepared. The method has the advantages that the production cost is greatly reduced, good economic benefits are obtained, and simultaneously, the cyclic utilization of the tungsten waste materials is also promoted. The tungsten carbide nanometer films prepared by adopting the sol-gel technology have the advantages that the density, the uniformity and the wear resistance are high, the treatment temperature is low, the reaction conditions are easy to control, and the like.