The invention discloses a feed for non-pregnant black pigs, and a preparation method thereof. The feed comprises the following active ingredients in parts by weight: 180-190 parts of wheat, 150-170 parts of peeled soybean meal, 130-140 parts of epiration of potato chips, 120-140 parts of ripening grape seed, 60-80 parts of eggplant seed, 30-50 parts of grass seed, 120-150 parts of shrimp meal, 70-80 parts of alfalfa meal, 10-15 parts of bovine-derived power, 40-45 parts of vegetable offal, 16-18 parts of hotbed chives, 10-12 parts of rehmannia, 10-15 parts of amaranthus viridis, 14-16 parts of lactuca indica, 12-13 parts of affine cudweed, 18-20 parts of orchis, 25-35 parts of water chestnuts, 30-40 parts of pumpkins, 35-50 parts of yoghurt, 7-8 parts of sunflower oil, 15-20 parts of abliflora petals powder, 0.3-0.5 parts of flavorant and 0.5-1 part of black pig nutrients. The feed is nutritional and healthy, delicious and tasty, safe and non-toxic, and can provide sufficient protein, fat, carbohydrate, vitamins, mineral substances and other nutritional substances, the health of sows can be guaranteed, the oestrus and ovulation of sows can be promoted, and the pregnancy rate and litter size of sows can be increased.