The application of the invention relates to a concentrated feed for preventing mastitis of cows, and a preparation method and equipment of the concentrated feed. The concentrated feed comprises the following components in parts by weight: 3-6 parts of biochemical fulvic acids, 2-6 parts of a mineral additive, 2-5 parts of a microorganism additive, 1-3 parts of yeast culture, 80-100 parts of bran,50-80 parts of soybean meal, 40-60 parts of corn, 15-35 parts of common andrographis herb, 5-25 parts of honeysuckle flowers, 15-20 parts of jujubes, 5-15 parts of fleeceflower roots, 2-15 parts of cowherb seeds, 1-10 parts of pangolin scales, 1-8 parts of common scouring rush herb, and 3-7 parts of herba portulacae. Through the adoption of the concentrated feed provided by the application of theinvention, the attack rate of the mastitis of the cows can be effectively reduced, and milk production is increased.