The invention provides an end cap of an endoscope. The end cap comprises a sleeve component, a bulge element and a movable sleeve, wherein the sleeve component is connected with the front end of the endoscope; the sleeve component, the bulge element and the movable sleeve are connected in sequence, and the movable sleeve can move freely on the outer surface of the endoscope. When the endoscope enters for examination, the end cap is of a smooth cylinder-like structure free of corner angles, the endoscope enters the digestive tract easily without scratching, when the endoscope withdraws, the movable sleeve moves towards the distal end and is propped against the sleeve component to provide support force for the bulge element, and the inner wall of the intestinal tract is distracted by the bulge element, so that quality of single endoscopic examination can be improved, and discomfort of a patient, operation risk and time cost are reduced.