Diabetic urine foam, usually caused by proteinuria, suggesting that there may be diabetic nephropathy, blood glucose may be poorly controlled, but also need to improve the blood glucose, glycated hemoglobin, renal function, urine biochemistry and other related tests to determine the severity of the condition. Foam in the urine may be caused by the presence of protein in the urine, normal people generally have no protein in the urine. Diabetic patients whose blood sugar is not under ideal control for a long period of time are prone to secondary kidney damage, i.e. diabetic nephropathy, in which the glomerular filtration membrane is damaged and the protein enters the urine through the filtration membrane, and the urine test will be positive for urinary protein. However, the foam in the urine does not determine the severity of the disease, but should also be combined with blood glucose, glycated hemoglobin, 24-hour urine protein quantification, renal function, urine biochemistry tests and other results to comprehensively analyze and judge the current condition of diabetic patients. Diabetic patients should strictly follow the doctor’s prescription of medication to maintain stable blood glucose and prevent the occurrence of diabetic nephropathy and other complications. If there is an increase in the number of urine bubbles and other phenomena, it is necessary to consult a doctor in a timely manner and follow the doctor’s instructions for symptomatic treatment to avoid aggravation of the condition.