Disclosed is a suction irrigator, including a tri-lumen tube which includes a normal-pressure irrigation lumen, a high-pressure irrigation lumen and a suction lumen, a manifold connected to the tri-lumen tube, two flexible tubes, a control unit and a dual-drainage tube connected to the two flexible tubes, where the cross-sectional area of the suction lumen is larger than that of the normal-pressure irrigation lumen, and the cross-sectional area of the normal-pressure irrigation lumen is larger than that of the high-pressure irrigation lumen； and the normal-pressure irrigation lumen and the high-pressure irrigation lumen are connected to one of the flexible tubes and the suction lumen is connected to the other flexible tube by means of the manifold； and flow rates of gas or liquid in the two flexible tubes are controlled by the control unit. The suction irrigator has a good irrigation effect and is convenient to use.
