The invention relates to an oral rehydration salt, which comprises the following components: sodium chloride, sodium citrate, sodium hydroxymethylcellulose, potassium sodium tartrate, potassium chloride, zinc acetate, zinc chloride, Anhydrous dextrose and deionized water. The oral rehydration salt has excellent therapeutic properties through the selection of specific components, the content limitation of specific ions, and a specific preparation method, etc., and has an excellent cure rate of diarrhea, so it has a good reputation in the field of medicine. Application prospects and industrial production potential.