Sow feed for improving litter birth weight and uniformity of sows and preparation method of sow feed

The invention discloses a sow feed for improving litter birth weight and uniformity of sows and a preparation method of the sow feed. The sow feed is prepared from the following raw materials: maize, bean pulp, wheat bran, fish meal, mountain flour, calcium hydrogen phosphate, sodium chloride, lysine hydrochloride, L-threonine, L-arginine, N-carbamyl-L-glutamic acid, choline chloride, L-glutamine, multi-vitamin, complex trace elements and a traditional Chinese medicine mixture, wherein the traditional Chinese medicine mixture comprises the middle part of radix angelicae sinensis, wine-fried radix paeoniae alba, ligusticum wallichii, milkvetch root, radix glycyrrhizae preparata, semen cuscutae, bulbus fritillariae cirrhosae, cortex magnoliae officinalis, fructus aurantii, Chinese galangal rhizome, herba schizonepetae, vinegar-fried folium artemisiae argyi and ginger. The sow feed disclosed by the invention is capable of effectively improving the birth weight of piglets, and reducing variable coefficients of birth weight of the piglets in a nest.