The invention provides a constipation-resisting complete formula feed for sows at the latter half of gestation. The complete formula feed is prepared from the following components: 19%-21% of corn, 10%-12% of soybean meal, 1.9%-2.5% of soybean peel, 28%-32% of wheat, 8%-12% of alfalfa powder, 13%-18% of barley, 1.5%-1.8% of soybean oil, 3%-8% of rice bran, 0.4%-0.7% of L-lysine sulfate, 0.20%-0.40% of L-threonine, 0.15%-0.20% of glycine betaine, 1.5%-2.0% of calcium hydrophosphate, 0.85%-1% of calcium carbonate, 0.01%-0.05% of sodium butyrate, 0.3%-0.5% of table salt, 0.5% of a vitamin premix, 0.3% of a microelement premix, 0.03% of a compound enzyme preparation, 0.02% of high-temperature-resisting phytase and the balance being other auxiliary additives. According to the constipation-resisting complete formula feed, the digestible rate of the feed can be increased and the digestion load of intestinal tracts is reduced; and high-quality fiber components and micro-ecological preparations are added so that the excessive absorption of water, caused by the fact that the digestion function is reduced, is avoided and the constipation of the sows at the latter half of gestation can be reduced.