The invention provides a lactogenic feed additive for sows and a preparation method thereof, and belongs to the field of feed additives. The lactogenic feed additive for the sows consists of the following components in part by weight: 0.1 to 0.3 part of organic chromium, 0.1 to 0.3 part of organic selenium, 30 to 50 parts of vitamin E, 0.4 to 0.8 part of folic acid, 0.01 to 0.1 part of biotin, 5 to 10 parts of L-carnitine, 20 to 40 parts of potassium chloride, 60 to 80 parts of tangerine peel, 10 to 30 parts of atractylodes lancea, 10 to 30 parts of astragalus, 20 to 40 parts of honeysuckle, 20 to 40 parts of hawthorn, and 200 to 300 parts of carrier. The metabolism of the sows is improved through the vitamin and the minerals, Chinese medicines have effects of clearing heat and releasing toxin, regulating intestinal tract, and regulating vital energy and activating blood, and the aims of protecting health, promoting milk secretion and improving the productivity of the sows are fulfilled by combining the vitamin, the minerals and the Chinese herbal medicines. The lactogenic feed additive has an obvious effect, and is lower in cost due to reasonable combination of the vitamin, the minerals and the Chinese herbal medicines.