The invention provides an electrolytic multivitamin for commercial pigs and a preparation method thereof. The electrolytic multivitamin comprises the following components in parts by weight: 10 to 30 parts of multivitamin for commercial pigs, 30 to 50 parts of anhydrous glucose, 1 to 10 parts of potassium chloride, 1 to 10 parts of sodium chloride, 1 to 3 parts of magnesium chloride, 0.1 to 2 parts of critic acid, 0.1 to 1 part of medicated leaven, 4 to 10 parts of bighead atractylodes rhizome extract, 5 to 10 parts of radix bupleuri extract, 2 to 8 parts of poria cocos extract, 1 to 5 parts of andrographis paniculata nees extract, 5 to 15 parts of fructo-oligosaccharide, and 20 to 40 parts of fumeihuang (a water soluble carrier). The components are matched to generate functions of clearing heat, removing dampness, promoting growth, enhancing phagocytic function of macrophage, strengthening the performance on resisting diseases and stress, promoting recovery from diseases, and improving meat quality.