Complete feed for promoting lactation and development of mammary gland of sow and preparation method for complete feed

The invention relates to a complete feed for promoting lactation and development of the mammary gland of a sow. The complete feed comprises the following raw material components: corns, soybean meal, egg powder, wheat bran, fish meal, flaxseed flour, collagen powder, red sugar powder, stone powder, calcium hydrogen phosphate, sodium bicarbonate, sodium chloride, L-threonine, L-valine, L-methionine, L-tryptophan, lysine hydrochloride, choline chloride, composite vitamin and composite minerals. The formula of the feed provided by the invention is reasonable and novel; the feed adapts to the physiological characteristics of a lactating sow; after the feed is applied, the complete feed can promote lactation and development of the mammary gland of the sow, is low in cost and can meet the practical production of a pig farm.