The invention discloses the application of kelsin and its homologues in the preparation of drugs for treating diabetic complications. Mouse neuropathy, see Example 1 for details, has a large safe treatment window, may not be tolerated, addictive and has few side effects, and is suitable for the preparation of drugs for treating diabetic complications. Potentially significant economic effects. Kiskinin and its homologues or pharmaceutically acceptable salts thereof have applications in the preparation and treatment of diabetic complications. They do not have the disadvantages of the above two types of commonly used clinical drugs for treating diabetic complications. They are developed in accordance with the national innovative drug approval method and are expected to become an effective treatment for diabetic complications. Diabetic complications (diabetic hypersensitivity and nerve fiber degeneration), intolerance and addiction, and small side effects, a national Class 1 new drug for the treatment of diabetic complications with independent intellectual property rights in my country, has a clear industrialization prospect.