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The invention discloses a fishbone-puffed snack food and a preparation method thereof. The fishbone-puffed snack food is prepared from fish wastes through the steps of cleaning and mincing the fish wastes; adding water to dilute the minced fish leftovers to a certain substrate concentration; after adding proteases so as to carry out enzymolysis for several hours on the conditions of an appropriate temperature and an appropriate pH value, sieving for removing meat, fat and other residues; carrying out fishy smell removal processing to obtain fishbones which are clean and free of fishy smell; drying the fishbones and carrying out superfine pulverization on the fishbones so as to obtain fishbone meal; and adding rice meal, white granulated sugar, other starches, salt and gourmet powder into the obtained fishbone meal, mixing, regulating moisture, and carrying out extruding and puffing and other processes obtain the fishbone-puffed snack food. By using the method disclosed by the invention, the utilization rate of wastes in aquatic product processing is improved, and the product added value is increased; the product is rich in organic phosphorus and calcium, therefore, the product is suitable for all people, especially children and old people and the like who need calcium supplement; and the process flow is simple, no swelling agent is required to be added, the energy consumption is low, the industrialized production is easy to realize, and byproducts such as fat and proteins can be recovered, therefore, the economic benefits and the social benefits are good.