The invention relates to a method for extracting betaxanthin from cockscomb. The method comprises the following steps of: shearing yellow inflorescence of the cockscomb, adding quartz sand, sufficiently grinding, lixiviating with gasoline and methyl methanol sequentially, removing supernate, lixiviating the obtained precipitation with redistilled water added with ascorbic acid, and concentrating the obtained supernate with a vacuum rotary evaporimeter in vacuum to obtain betaxanthin powder. The method has the advantages of easily obtained material, high yield, simple extracting process, high extraction ratio and high purity of the obtained betaxanthin.