The invention discloses a marinating material of sauced beef and a preparation method of the sauced beef. The preparation method comprises the following steps of using 100 parts of to-be-sauced beef as a base material, and using the following auxiliary materials, wherein pickling materials comprise salt, pepper, star anise and fennel; spicy materials comprise clove, fructus amomi, amomum cardamomum, netmeg, fructus galangae, cinnamon, pepper, star anise, licorice root, bay leaves, root of hairy asiabell, angelica root, amomum tsao-ko, hawthorn, monosidum glutanate and orange peel; seasoners comprise salt, yellow wine, hoisin sauce, soybean source, garlic, ginger, scallion and rock candy; pretreating the raw materials, pickling, pre-cooking, preparing marinating water, soaking into the marinating water, preparing in the marinating water, cooling, and packaging the finished product, so as to obtain the sauced beef product. The sauced beef has the advantages that by adopting a formula, the flavor of the prepared sauced beef is particular, and the mouth feel is good; the flavor of the sauced beef is furthest maintained by the method of controlling the flavor deteriorating of the sauced beef, and the shelf life of the product is obviously prolonged.