The invention relates to concentrated feed for a weaned pig and a preparation method thereof. The concentrated feed comprises puffed corn flour, high-protein soybean meal, puffed soybean, fish meal, high-protein milk replacer, calcium hydrogen phosphate, stone flour, first-grade bean oil, lysine, methionine, threonine, tryptophan, refined salt, piglet compound enzyme, zinc oxide, a sweetener, a flavoring agent, an anti-oxidant, probiotics, and a piglet premix. The concentrated feed for a weaned pig has comprehensive and balanced nutrition, strong pertinency, a low production cost, high efficiency, stable quality and storage convenience. In feeding, the concentrated feed has good attractability and stability, satisfies requirements of appetite improvement and fast growth of a weaned pig, greatly improves food consumption and a growth rate of a weaned pig, accelerates digestion and absorption of feed nutrients, has a high feed conversion rate, reduces a weaned pig diarrhea rate and a weaned pig death rate and has no adverse side effects.