The invention provides a built-in catheter. The built-in catheter comprises a catheter body and a control valve, wherein the inside of the catheter body is hollow and serves as a urine guide cavity, one end of the catheter body is provided with a urine inlet, the other end of the catheter body is provided with a urine outlet, the catheter body comprises a partes prostatica part, a membranous partand a bulb part, the control valve is positioned inside the urine guide cavity and is used for controlling the on-off state of the urine guide cavity, in order to enable the catheter body to be stablyfixed inside the male urethra, the partes prostatica part is provided with a partes prostatica bulge, the bulb part is provided with a bulb bulge, the membranous part is provided with a membranous sinking part, the partes prostatica bulge, the bulb bulge and the membranous sinking part between the partes prostatica bulge and the bulb bulge are bent-dumbbell-shaped in the male urethra, thus the front-back movement of the catheter body can be prevented, and meanwhile, the interference pressing for the neck of the male bladder and the urethra can be eliminated.