An endoscope including a catheter, a steering handle for controlling the bending of the catheter, and a pipe connector. The catheter includes an outer tube and an inner tube. The outer tube is sleeved outside the inner tube. The steering handle includes a handle sleeve and a handle cover. The handle sleeve is sleeved outside the handle cover. An axial guide rail and a sliding block are arranged between the handle sleeve and the handle cover. The guide rail and the sliding block are fixed on the handle sleeve or the handle cover respectively. The outer tube is fixedly connected with the handle sleeve. The inner tube penetrates a through hole in the center of the handle sleeve, is connected with a port of the pipe connector and fixed therein. The pipe connector is positioned in the handle cover and fixedly connected therewith.