The invention provides a cattle fattening feed, and relates to the technical field of animal feeds. The cattle fattening feed disclosed by the invention is obtained through fermenting the following raw materials of corn straw, soybean meal, sweet potato vines, wheat bran, shrimp and crab scrap proteolysis substances, pine twigs, argy wormwood leaves, black beans, medicated leaven, cyrtomium rhizomes, haws, broad beans, Chinese yams, aloe, bighead atractylodes rhizomes, great burdock achene, wrinkled gianthyssop herbs, cortex magnoliae officinalis, perilla frutescens, salt, yeast powder and lactic acid bacteria powder. When the feed is used as a feed for cattle at the fattening period, the dressing percentage of the obtained cattle can reach 59.2%, the meat production rate can reach 68.44%,and the net meat percentage can reach 42.18%. Beef is milky white in color, intramuscular fat precipitate is uniform and close in distribution, the meat quality is tender, and the smell is pure. Thecattle fattening feed is a feed for the cattle at the fattening period, which takes account of fattening effects and the mouth feel of the beef.