The invention discloses feed for improving the estrus and increasing the lactescence of a sow and a preparation method thereof. The feed is prepared from the following raw materials: corn, wheat bran, bean pulp, a medical stone, fish meal, calcium hydrophosphate, pine needle meal, table salt, ferrous citrate, zinc citrate, compound vitamin, compound amino acid, fulvic acid bacterium, bacillus, caragana arborescens, radix platycodi, cushaw root, sweet potato stem and leaf, cowherb seed, herba epimedii, semen cuscutae, corn stigma, fructus rubi and fructus crataegi. The feed which is provided by the invention is overall in nutrition; the nutritional requirements of the sows during a gestation period and during a lactation period can be met; moreover, the appetite and the digestion of the sow can be enhanced and facilitated; the fat loss condition during the lactation period can be reduced; the puerperal sow is helped to quickly recover body functions and to increase the lactescence and disease resistance, so that the sow lactates sufficient and high-quality milk; piglets are big in born bodies and high in survival rate; after ablactation, the normal estrus of the sow can be facilitated; a time interval from the ablactation to an estrus period can be shortened; the estrus rate of the sow after the ablactation is increased.