The invention provides an ejector spray pipe. The ejector spray pipe comprises multilevel ejection spray pipes, a mixing chamber and a supersonic speed tail spray pipe. The ejection spray pipes are laval spray pipes, and a plurality of groove holes are evenly distributed and formed in the expansion segment wall of each ejection spray pipe in the circumferential direction, so that the ejected air flow is introduced consequently; the first-level air inlet end of the first-level ejection spray pipe is connected with a pressure stabilizing chamber, and the multilevel ejection spray pipes are in series connection in a step-by-step manner through the mixing chamber; and the last-level ejection spray pipe is connected with the supersonic speed tail spray pipe. According to the supersonic speed ejection spray pipe, the grading air inlet manner is adopted in the ejected air flow, and the contact area between the ejected air flow and the ejection air flow is large; mixing is sufficient, and the suction effect is good; and parts are fixed through welding, all components are located on the axis, and the ejector spray pipe is easy to machine and mount.