The invention discloses a cicada / oyster composite crab feed which is characterized by being prepared from the following raw materials in parts by weight: 25-30 parts of wheat bran, 23-28 parts of rice bran, 0.4-0.8 part of sodium sorbate, 1-3 parts of threonine, 2-4 parts of salt, 0.2-0.6 part of neotame, 1-3 parts of tertiary calcium phosphate, 2-4 parts of star anise, 18-25 parts of fish bone, 26-34 parts of cicada, 13-16 parts of oyster, 0.1-0.4 part of mustard oil, 2-5 parts of linseed oil, 15-18 parts of caraway, 19-24 parts of cabbage, 12-15 parts of lilac, 16-23 parts of potato, 19-26 parts of skin of gourd, 0.2-0.4 part of Chinese pulsatilla root, 0.1-0.3 part of coptis chinensis, 0.4-0.6 part of ginseng leaf, 3-6 parts of a phagostimulant and a defined amount of water. According to the feed provided by the invention, as the cicada and the oyster are added, the protein content is high, and the weight gaining speed of the crabs can be increased; the Chinese herbal medicines such as Chinese pulsatilla root, coptis chinensis and ginseng leaves are added, the disease resistance and appetite of the crabs can be improved, the absorption is fast, and the meat of the crabs is stronger than that of wild crabs, and the breeding survival rate of the crabs can be increased by long-term eating of the feed.