Chinese herbal medicine bait for improving disease-resistant immunity of grass carp

The invention discloses Chinese herbal medicine bait for improving the disease-resistant immunity of grass carp. The Chinese herbal medicine bait is prepared by powdering coptis chinensis, rhubarb, astragalus, isatis root, weeping forsythia, purple perilla, grassleaf sweelflag rhizome, Chinese gall, ginger and garlic, and mixing the powder of the raw materials. A grass carp feed formula comprises wheat middling, imported fish meal, beer yeast powder, wheat bran, rice bran meal, 46-percent soybean meal, rapeseed meal, rock flour, soybean oil, salt, calcium hydrophosphate, MZ, phytase, complex enzyme, choline, 98.5-percent lysine, 99-percent threonine, VC (Vitamin C), VE (Vitamin E), antioxidants and mildew preventives. Chinese herbal medicines are added into a feed according to the proportion of 1-1.5 percent to prepare bait particles with different grain diameters. The bait does not pollute the environment, cannot be enriched in a fish body, and facilitates prevention and cure of large-area fish disease. The death rate is reduced, and the growth speed is increased.