The invention discloses a dredger for a ventricular outflow tract. The dredger is mainly divided into a guiding area, an expanding area, a working area and an operating control area, wherein the guiding area is a steerable rod provided with a metal probe; the expanding area is of a conical structural shape, one end of the expanding area is connected with the guiding area, and the other end of the expanding area is connected with the working area; the working area is the working platform of the dredger for the ventricular outflow tract, and a rotary cutter and a longitudinal cutter are arranged in the working area; the rotary cutter is closely attached to the inner side of the pipe wall of the working area; the operating control area is provided with a rotary cutter operating device, and the rotary cutter operating device is in rigid connection with the rotary cutter and controls the rotary cutter to be folded or unfolded. The dredger can be conveniently, quickly, easily and safely used for probing and dredging the ventricular outflow tract. Therefore, dredging of the narrow ventricular outflow tract can be easily completed.