The invention relates to a method for preparing a dried full-fish slice from fish bone, minced fish flesh, fish skin, fish fins, fish scales and the like which are leftovers and are not sufficiently used in conventional aquatic product processing. The method comprises the following steps: putting pre-processed fish bone, minced fish flesh, fish skin, fish fins, fish scales, suet, etc. into a mincing machine; carrying out bare blending, salt blending and seasoning blending so as to prepare full-fish suet mixed full-fish glue; and then successively carrying out spreading, drying, baking, slicing, inner packing, disinfection and outer packing so as to prepare the dried full-fish slice. The dried full-fish slice is leisure food developed on the basis of excavation, reorganization and learning of the ancient dish Yuyangxian; preparation steps for the dried full-fish slice are simple and reasonable; the prepared dried full-fish slice inherits nutritional, body-building and nourishing effects of both fish and suet, eliminates a fishy smell and a muttony smell, has delicious taste, is rich in calcium and collagen and has dietotherapic health care effects like calcium supplement, beauty treatment, blood nourishing and activation, kidney tonification, essence securing, liver nourishing, blood vessel softening, blood fat reduction, brain tonification and aging delaying.