Disclosed in the present invention is a sodium pyruvate oral rehydration salt composition for treating hypovolemia or hyponatration associated with hypohydration, said composition containing the following components: (i) 2.0-6.0 parts by weight of sodium pyruvate； (ii) 1.5-17.0 parts by weight of sodium chloride； (iii) 0-2.0 parts by weight of potassium chloride； and (iv) 10.0-50.0 parts by weight of glucose anhydrous or other carbohydrates. The weight of components (i)+(ii)+(iii)+(iv) constitutes 50-100% of the total weight of the composition.
