The invention relates to a feed additive for sows in a perinatal period, which comprises cowherb seed 13-17 parts, angelica sinensis 11-13 parts, rhizoma atractylodis macrocephalae 5-8 parts, ligusticum wallichii 5-8 parts, fenugreek 5-8 parts, myrrh 4-5 parts, astragalus mongholicus 4-5 parts, pericarpium citri reticulatae 4-5 parts, red flower 2-3 parts, dandelion 2-3 parts, liquorice 2-3 parts, leonurus 1-2 parts and scirpus yagara 1-2 parts and is prepared by drying the materials for 2-3 days, smashing and mixing the materials. The feed additive for sows in the perinatal period can promote milk secretion postpartum sows and enable piglets to develop healthily.