The invention provides grass carp feed and a making method thereof, and relates to the field of fish feed. The grass carp feed comprises, by weight, duckweed, folium isatidis, rice bran, wheat bran, corn flour, bean pulp, vinasse, fish meal, feed yeast, Chinese herbal medicine additives, methionine chelated copper, lysine chelated zinc, arginine chelated magnesium, leucine chelated iron, tryptophan chelate, vitamin E, monocalcium phosphate and water. The grass carp feed is reasonable in matching, the protein content is 30-35%, the carbohydrate content is 38-60%, and the grass carp feed also contains rich vitamins, amino acid and the like, so that the nutritional requirements of crucian carps in the growing period are met, growth of fishes is effectively promoted, the growing speed of crucian carps is increased, the body form becomes much better, meat quality is obviously improved, and high disease resistance and safety are achieved.