The invention provides a grass carp feed. The grass carp feed comprises sub-powder, wheat bran, colza cakes, soybean meal, maize germ meal, steepwater-jetting maize bran, fish meal, meat and bone meal, sesame seed meal, monocalcium phosphate, bentonite, soybean oil, lysine, methionine, choline chloride and premix and is characterized in that: alternanthera philoxeroides, parthemum powder, garlic powder, pine needle powder and rhubarb powder are added into the feed. A processing method of the grass carp feed comprises the following steps of: pulverizing or grinding the ingredients of the feed; adding the raw materials into a stirring machine to stir; and bagging and packaging the stirred feed. The grass carp feed can improve immunity and disease resistance of grass carp, effectively reduces the incidence rate of enteritis, lousy gill disease, red skin disease and explosive hemorrhage of the grass carp, increases the survival rate of fish fry, promotes the growth of the grass carp and effectively reduces bait coefficient of the grass carp.