The injection needle of insulin needs to be changed daily. Subcutaneous insulin injection is an effective method to control blood sugar in diabetic patients. Subcutaneous insulin injection is mainly suitable for type 1 diabetes, type 2 diabetes that is not treated with oral hypoglycemic drugs, combined with acute and chronic complications, as well as gestational diabetes. The use of insulin requires the selection of the appropriate type of insulin and the number of injections according to the patient’s specific situation under the guidance of a doctor. In the process of subcutaneous insulin injection, insulin injection needles need to be changed daily because insulin injection needles are single-use devices and repeated use of insulin injection needles can lead to barbs and increased pain. Repeated application can also lead to needle blockage and even needle breakage, and repeated application of the injection needle can easily lead to infection at the injection site, as well as aggravate the symptoms of irritation at the injection site and lead to hard nodules or atrophy of subcutaneous fat.