Abstract: Disclosed in the present invention is a composition for treating diarrhea, comprising the following components calculated by weight ratio: Colocasia esculenta and antidiarrheal foods. The composition of the present invention has low cost, available raw materials, is safe and non-toxic, and is suitable for industrial production. The antidiarrheal effect of the product is remarkable. The rehabilitation time for the common diarrhea is 24-48 hours, and for the diarrhea caused by rotavirus is 48-72 hours, and the rehabilitation time is shortened by 2.5 days on average. The effective rate for persistent diarrhea within 5 days is 90.16%. For diarrhea of infants with milk protein allergy during the addition of supplementary feeding, six to eight kinds of foods can be added in one month, and thus the composition is especially suitable for infants and young children.