The invention relates to a feed capable of preventing and treating diarrhoea of pigs as well as a preparation method and application of the feed. The feed comprises the following components in parts by weight: 40-60 parts of corn, 2-6 parts of emulsified oil powder, 2-4 parts of whey powder, 0.5-1 part of barley malt, 10-15 parts of soybean meal, 8-15 parts of puffed soybeans, 3-5 parts of fish meal, 0.2-0.5 part of protein powder, 4-8 parts of a cinnamaldehyde preparation, 0.1-0.3 part of curcumin, 0.5-2 parts of honey and 2-6 parts of a premix. The preparation method comprises the followingsteps of during preparation, firstly, crushing the corn, the barley malt, the soybean meal and the puffed soybeans, and then performing uniform mixing with other substances. When the feed is used, each 1kg of the pigs is fed with 12-30g of the feed. Compared with the prior art, the feed disclosed by the invention can be preservative, can sterilize, and is antivirus, according to the feed, intestinal peristalsis of gastrointestinal tracts can be strengthened, the utilization efficiency of the feed is improved, the growth of animals can be promoted, the generation of diarrhoea of nursery pigs isreduced, and further the economic losses caused by diarrhoea of the pigs on a pig farm are reduced.