The invention relates to a method for recovering tungsten carbide from discarded hard alloy. In the method, the discarded hard alloy is put into electrolyte and dissolved in the electrolyte, so that tungsten carbide granules are separated out, and then, preprocessing, i.e. magnetic separation and breaking, is carried out. The method is characterized in that the method also includes the following steps that: the preprocessed tungsten carbide is decarburized, dissolved in alkali, ammoniated, calcined, reduced and carburized, so that the tungsten carbide is produced. The method can produce recycled tungsten carbide powder with an excellent grain structure and less micro-inclusions, and meanwhile, the method has high recovery efficiency.