The invention relates to a preparing method of a sow feed. The sow feed is prepared from, by weight, corn, white gourd, vegetable cakes, fish meal, tapioca flour, donkey-hide gelatin, zeolite powder, bone meal, soybean oil, garlic powder, citric acid, wheat oligopeptides, calcium phosphate, sodium chloride, calcium glycinate, taurine, L-citrulline, L-phenylalanine, methionine, choline chloride, lutein, calcium pantothenate, vitamin A, vitamin B, vitamin C, vitamin K, riboflavin, pyridoxamine, folic acid and selenium yeast. The sow feed has the good effect of improving nutrient balance of sows, helps boosting immunity, and promotes growth and development.