Abstract: An examining device for an aortic valve and a pulmonary valve competency has a cylinder and a liquid infusion catheter assembly. The cylinder has a proximal end, a distal end, a liquid channel and an air channel. The proximal end has a first opening and a transparent lens on the proximal end and sealing the first opening. The distal end has a second opening communicating with the first opening. The liquid channel has a liquid intake hole and a liquid outtake hole communicating with the liquid intake hole. The air channel has a first air intake hole and an air outtake hole communicating with the air intake hole. The liquid infusion catheter assembly connects with the proximal end of the cylinder. The examining device allows surgeons to immediately examine whether a surgery for valves is successful.