The invention discloses a pregnant sow feed for control of constipation and a producing method thereof, and the pregnant sow feed comprises the following raw materials by weight: 150-180 parts of corn flour, 100-150 parts of soybean meal, 120-160 parts of wheat bran, 70-90 parts of flour, 100-130 parts of fresh chicken manure, 50-60 parts of rice bran, 30-50 parts of rapeseed cake, 30-40 parts of wheat straw powder, 0.5-1 part of lactic acid bacteria fermentation agent, 40-50 parts of withered leaves of grass and trees, 50-60 parts of crop straw, 8-10 parts of gracilaria lemaneiformis, 14-18 parts of germ polished rice, 5-6 parts of black sesame seed, 1-2 parts of dehydrated spinach, 1-2 parts of plant protein, 0.5-1 part of white sugar, 5-10 parts of hawthorn powder, 5-7 parts of amaranth leaf powder, 2-3 parts of peanut bran, 2-3 parts of white atractylodes rhizome, 2-3 parts of loranthus parasiticus, 0.5-1 part of plantain, 0.5-1 part of magnolia officinalis, 50-70 parts of silage, 20-30 parts of wheat middling, 3-5 parts of expanded vermiculite powder, 10-15 parts of an attractant, and the proper amount of water.