The invention provides a traditional Chinese medicine patch for preventing piglet diarrhea as well as a preparation method and application thereof, belonging to the field of veterinary drugs. The traditional Chinese medicine patch comprises the following components: 10-20 parts of largehead atractylodes rhizome, 15-25 parts of gordon euryale seed, 8-12 parts of costustoot, 8-12 parts of clove, 15-22 parts of officinal magnolia bark, 15-20 parts of radix bupleuri, 10-18 parts of baical skullcap root, 10-20 parts of radix astragali, 10-20 parts of liquorice root, 10-15 parts of radix codonopsis and 3-9 parts of dried ginger. The product can be directly applied to navels of piglets, is fast in medicine absorption, has the effect of overcoming the defects of poor palatability and slow absorption of oral medicines, has the functions of reducing the diarrhea rate, improving the immunities of the piglets and promoting development of digestive organs, has the advantages of nature, no toxic or side effect, no medicine resistance, no residues, fast excretion, and the like, has short course of treatment and high cure rate, has piglet diarrhea cure rate of 88.4%, achieves good treatment effects and does not irritate skins. The preparation process is simple and practicable, is low in cost and is suitable for industrial production.