The invention discloses a lactating sow compound feed capable of relieving astriction under the sow heat stress condition. The lactating sow compound feed is prepared from the raw materials in ration:corn, 46% soybean meal, soybean hull, wheat flour, soybean oil, complex vitamin, mineral elements, probiotics, phytase, beta-glucanase, xylanase, 98% L-lysine hydrochloride, 98% L-threonine, 99% DL-methionine, tryptophane, valine, 60% choline chloride, table salt, sodium bicarbonate, calcium carbonate, calcium monohydrogenphosphate, glucose and fish meal. A high-energy high-protein daily ration design idea is utilized, excellent protein raw materials are utilized, an ionic equilibrium technology is utilized, and the soybean hull is utilized in a large proportion; compared with traditional daily ration, the lactating sow compound feed can remarkably improve feed intake and dietary fiber intake of sows in a lactation period and effectively relieves astriction situation; sow backfat loss isreduced, weaning weights of piglets and utilization periods of the sows are indirectly improved.