According to the Requirements for Health Screening of Blood Donors, diabetics are not allowed to donate blood. The Requirements for Health Screening of Blood Donors clearly state that people with endocrine system diseases and metabolic disorders such as adrenal disease, functional thyroid disease, diabetes mellitus, acromegaly, uremia, etc. are not allowed to donate blood, so diabetic patients are not allowed to donate blood. Due to the disorder of sugar metabolism in diabetic patients, the endocrine system is already out of order, long-term high blood sugar will lead to a variety of complications, and donating blood may aggravate the condition, causing dizziness, heart failure, and severe anemia. Blood donation is an invasive operation, and wounds of diabetic patients are more difficult to heal, which can easily cause infections. Diabetic patients use medication to control blood sugar for a long period of time, and the medication is easy to be left behind, which affects the quality of blood. Diabetic patients should pay attention to monitoring blood glucose and follow the doctor’s instructions for treatment.