The invention discloses an antibiotic-free weaned-piglet complete feed and a preparing method thereof. The antibiotic-free weaned-piglet complete feed is antibiotic-free efficient complete feed capable of meeting the nutritional requirements of weaned piglets, promoting digestion and using of nutrient substances, improving the immunity function and the resistance of piglet bodies and reducing the diarrhea rate. The preparing method includes the steps that in the formula proportion, weighed corn, weighed high protein bean pulp and weighed extruded soybeans are smashed to be subjected to first-time high-temperature pelletizing, thin smashing is carried out after pellets cool, then weighed imported fish meal, weighed calcium hydrophosphate, weighed mountain flour, weighed salt, weighed soybean oil, weighed whey powder, weighed feed grade lysine, weighed methionine, weighed threonine, weighed premixed materials for the weaned piglets and compounded Chinese herbal medicine are mixed to be even, then second-time low-temperature pelletizing is carried out, cooling is carried out, then a finished product is packed, and the weaned piglets can be directly fed. Particles of the weaned-piglet feed produced with the preparing method are good in filling power, low in hardness, good in water dissolving performance, high in nutritive value, good in palatability, sanitary and safe, the diarrhea rate is reduced, the feed use ratio of the weaned piglets is increased, the production performance of the weaned piglets is improved, and antibiotic harm is avoided.