An adjustable sphincter exerciser (Kegel exercise) includes a flexible tubular member, at least one sleeve mounted to the tubular member; a body inserted into the tubular member, a conductive device connected to the body and located in the tubular member, the conductive device being activated when the tubular member is compressed, a vibration unit electrically connected to the conductive device, and a power unit providing power to the conductive device and the vibration unit. The at least one sleeve can be replaced and has different hardness, when the user squeezes the at least one sleeve and the tubular member to activate the conductive device and the vibration unit, the user is acknowledged the force that sphincter is exercised. The adjustable sphincter exerciser (Kegel exercise) enhances the muscular strength and the muscular endurance of the sphincter.