The invention discloses the drug application of epimedin C for treating diabetic liver injury, and belongs to the technical field of biomedicine. The present invention discloses for the first time that epimedin C can increase the level of high-density lipoprotein cholesterol in the liver of diabetic model animals, reduce the level of low-density lipoprotein cholesterol in the liver, alleviate the problem of lipid metabolism disorder, reduce liver index, and enhance superoxide dismutase in the liver , Glutathione peroxidase activity, reduce malondialdehyde content, improve liver oxidative stress state, maintain normal shape and structure of liver cells and tissues, reduce liver alanine aminotransferase and aspartate aminotransferase activity levels, and promote liver function repair, Therefore, it can be used to prepare medicines for treating diabetic liver damage. Epimedin C prepares a medicine for treating diabetic liver damage and uses it in the form of pharmaceutical preparations, including buccal tablets, coated tablets and hard capsules. The invention provides a basis for the treatment of diabetic liver damage, and also provides ideas for the deep development and utilization of epimedium resources.