After renal tubular injury, the recovery of renal tubular epithelial cell function will be relatively delayed, and it usually takes several days to several months to recover, and some of them even cannot recover completely. Due to the degree of injury and individual differences, the recovery time also has some differences and cannot be generalized. The renal tubule is a slender epithelial tubule connected to the wall layer of the renal capsule, with the function of reabsorption and excretion, playing a key role in the excretion of metabolites, maintaining fluid balance and acid-base balance of the body. Ischemia, infection and toxins can cause renal tubular epithelial cell degeneration and necrosis, which can lead to renal function injury. If renal tubular injury caused by ischemia, infection and toxicants leads to degeneration and necrosis of epithelial cells, it usually takes several days to several months before renal tubular epithelial cells gradually repair, regenerate and cell and organ function gradually recover, and renal function may also gradually improve in some patients. If the recovery of tubular function, reabsorption and glomerular filtration is delayed, it may be accompanied by symptoms such as polyuria and hypokalemia, which usually take several months to recover, and some patients may even be left with different degrees of renal structural and functional damage. It is recommended that patients with renal tubular injury should go to the hospital in time and follow the doctor’s instructions for standardized diagnosis and treatment, so as to avoid delaying the condition.