The invention discloses a cow feed. The cow feed comprises the following components in parts by weight: 25-40 parts of wheat bran, 6-12 parts of clover, 10-20 parts of cottonseed cake, 10-18 parts of carrot, 10-15 parts of fermentation straw, 3-8 parts of sesame slag, 2-8 parts of Chinese angelica, 7-15 parts of Radix Codonopsis, 1-3 parts of methionine, 3-6 parts of Radix Astragali, 1-4 parts of milk thistle, 5-10 parts of white peony root, and 1-3 parts of bentonite. The cow feed is capable of enhancing body immunization function, promoting cow growth, and improving cow production performance; a traditional Chinese medicine mixture has the efficacies for clearing heat and detoxifying, invigorating blood circulation and promoting lactation, expanding blood vessel, tonifying kidney, benefiting qi and invigorating spleen, and enhancing immunity of human body; milk quality is improved, product has no residue and no pollution, bentonite is added, body metabolism is adjusted, poison in the body can be absorbed, harmful bacterium is absorbed and inhibited, productivity of livestock and poultry is increased, no hormone and no chemical residue can be generated, cow appetite is increased, cow health production can be promoted, and high-quality milk output is increased.