The invention relates to the technical field of pig feeds, and particularly relates to a piglet feed and a preparation method thereof. The piglet feed is prepared from the following raw materials in parts by weight: 55-65 parts of corn flour, 20-30 parts of bean pulp, 5-10 parts of whey powder, 4-5 parts of fish powder, 1.5-2 parts of silkworm chrysalis meal, 2-3 parts of shrimp meal, 2-3 parts of wheat flour, 1-1.5 parts of citric acid, 2-3 parts of herba portulacae, 1-2 parts of honeysuckle, 1-3 parts of indian kalimeria, 1-2 parts of copperleaf, 2-3 parts of poria, 1-2 parts of japanese apricot roots, 3-4 parts of pachyrhizus roots, 1-2 parts of agrimony, 0.8-1 part of calcium hydrogen phosphate, 0.6-0.7 part of shell powder, 0.3 part of edible salt, and 3-4 parts of additives. The preparation method comprises the following steps: weighing the raw materials, crushing, mixing, pelletizing, and packaging. The piglet feed is reasonable and practical in formula, complete in nutrients, good in appetite, and easy to digest, and can effectively prevent diarrhea of piglets, enhance the immunity of the piglets, and enable the piglets to grow fast.