The invention discloses a heat-stress-relieving compound feed for a perinatal-period sow and a preparation method of the compound feed. The feed comprises the following components by mass percent: 53-60% of corns, 15-25% of bean pulp, 1-5% of wheat bran, 1-4% of rice bran, 8-18% of DDGS (Distillers Dried Grains with Soluble), 1.2-1.8% of bean oil, 1.0-2.0% of microcapsule-coated coconut oil, 1.0-1.4% of calcium hydrogen phosphate, 0.8-1.2% of limestone, 0.8-1.2% of arginine, 0.1-0.3% of lysine, 0.1-0.2% of methionine, 0.03-0.06% of threonine, 0.1-0.2% of choline chloride, 0.30-0.45% of salt, 1-2% of a premix and 0.02-0.05% of a complex enzyme preparation. According to the compound feed, by regulating and controlling the nutrition of the perinatal-period sow and improving the viability of a new born piglet in hot weather and the milking performance of the perinatal-period sow, the health condition of the perinatal-period piglet is improved and the growth speed of the perinatal-period piglet is increased.