The utility model relates to a straight-through cyclone liquid atomization ejector used in fire-extinguishing field, comprising a main body and an ejection hole, wherein the main body is a hollow cylinder inside which a screw rod is arranged, the circumference of the screw rod is arranged with a screw groove, the screw rod is sliding mounted in the main body, the screw groove and the inner wall of the ejector form a screw channel, the lower portion of the main ejector is arranged with an axial through hole as the ejection hole, the outer side of the ejection hole is arranged with an external conical angle while the inner side is arranged with an internal conical angle. And the utility model has small volume, low weight, simple structure, easy assembly, high extinguishing efficiency and low fire retardant consumption.