The invention discloses an anti-inflammatory antidiarrheal chicken feed and a preparation method thereof. The anti-inflammatory antidiarrheal chicken feed is prepared from the following raw materials in parts by weight: 500-600 parts of grape seed meal, 2-3 parts of a yeast extract, 8-10 parts of pawpaw protein powder, 23-25 parts of artemisia argyi, 17-21 parts of loosestrife, 14-16 parts of black sesame powder, 4-5 parts of nardostachys jatamansi powder, 65-68 parts of double-low rapeseed meal, 21-25 parts of broccoli dregs, 12-14 parts of crucian powder, 19-22 parts of sonchus oleraceus powder, 32-37 parts of water chestnut powder, 45-48 parts of gourd seed powder, 3-4 parts of garlic juice, 2-3 parts of corn germ oil, 12-13 parts of cabbage mustard dregs, 34-36 parts of black bean dregs, 4-5 parts of pomegranate vinegar, 5- parts of lithospermum, 7-8 parts of dendrobe leaves and 3-4 parts of agrimonia pilosa powder. Due to addition of components such as artemisia argyi, lithospermum, dendrobe leaves and agrimonia pilosa, the antibacterial and anti-virus properties of chicken can be effectively improved under the action of synergism of the components, meanwhile diarrhea diseases of chicken can be also effectively prevented and treated, and the survival rate of chicken can be increased.