Peritoneal dialysis machines have the function of replacing the kidneys in removing toxins and excess water. A peritoneal dialysis machine is a medical device suitable for dialysis of the membrane cavity. Dialysis is performed by utilizing the body’s abdominal cavity and the peritoneum that encases it. The use of a peritoneal dialysis machine allows metabolic wastes and excess water in the blood to enter the abdominal cavity through small holes in the peritoneal membrane and be discharged to the outside of the body along with the dialysis solution, thus serving as a substitute for the kidneys in the elimination of toxins and excess water. Although peritoneal dialysis machine can replace the function of the kidneys to excrete toxins and excess water, it can not completely replace all the work of the kidneys, and does not have the endocrine regulation function of the kidneys, so patients should not overly rely on the peritoneal dialysis machine. Long-term use of peritoneal dialysis machine may cause a series of complications such as cardiovascular and cerebrovascular diseases or inflammatory infections, patients should pay attention to the rational use and use under the guidance of professional physicians.