Blood glucose 14mmol/L either fasting blood glucose, random blood glucose, 2 hours after meal blood glucose, have reached the diagnostic criteria of diabetes, usually can not be self-recovery. It is necessary to take glucose-lowering medication or choose insulin injection treatment as prescribed by the doctor. Usually the blood glucose assessment criteria include fasting blood glucose, random blood glucose, postprandial 2-hour blood glucose and so on. When fasting blood glucose ≥7.0mmol/L, random blood glucose or 2-hour postprandial blood glucose ≥11.1mmol/L, any one of them and the symptoms of “three more and one less” have reached the diagnostic standard of diabetes. Therefore, blood glucose 14mmol/L has reached the diagnostic standard of diabetes mellitus, and cannot be recovered by itself. You can choose metformin, glibenclamide, acarbose and other hypoglycemic drugs for treatment as prescribed by the doctor, and if necessary, you can choose menthyl insulin and glycemic insulin for treatment. If the blood glucose is 14mmol/L, it is recommended to go to the hospital in time for early and regular treatment.