A barley green health keeping gadus cake is prepared from, by weight, 80-90 parts of gadus, 3-5 parts of Se-enriched lactobacillus casei, 2-3 parts of table salt, 2-3 parts of glucose, 3-4 parts of barley green, 25-30 parts of bee milk, 35-40 parts of yellow peaches, 20-25 parts of honey, 15-20 parts of apple vinegar, 6-7 parts of mung beans, 1-2 parts of jasmine flowers and the like. According to the barley green health keeping gadus cake, the gadus is fermented through the lactobacillus casei, fish protein can form gel organization after being slowly acidized through organic acid, the elasticity and hardness of fish are improved, and the color, luster and flavor are improved; the fish is matched with brown sugar, the fruit vinegar and the like to prepare the cake, and the cake has the fragrant and sweet flavor; to increase the content of dietary fiber of the cake, lemon pomace dietary fiber is added, the waste of lemon pomace can be avoided, and the lemon pomace can promote intestinal tract movement; specially, the barley green is added to tonify deficiency, moisten dryness and resist cancers and aging and has the effect of keeping health; meanwhile, gynostemma pentaphylla, Chinese caterpillar fungus, pseudo-ginseng, rhodiola rosea and other traditional Chinese medicine extract are matched, and the effects of tonifying deficiency and resisting aging of the barley green health keeping gadus cake are enhanced.