The invention discloses a strong dynamic ejector and belongs to cyclone pressurizing devices for various kinds of fluid. According to the strong dynamic cyclone ejector, a double-helix impeller or a single-helix impeller is used for obtaining a strong cyclone field, a single-direction momentum is converted into a multi-direction momentum, and thus efficient and high-supercharge-ratio ejection is completed. The ejector is of a vertical structure and comprises an external machine body, the double-helix impeller or the single-helix impeller, a main shaft mechanism, a main shaft supporting device and a main shaft sealing device, wherein the external machine body is composed of a motor base, a bearing box, a cylinder, a shrinkage pipe, a throat pipe and a diffuser pipe. A cantilever structure supported by a specific span bearing is adopted by the main shaft supporting device, and a mechanical seal arranged in a sealing box is adopted by the main shaft sealing device. According to the strong dynamic cyclone ejector, the double-helix impeller or the single-helix impeller rotates at a high speed to obtain a strong cyclone field, so that efficient momentum conversion is achieved, the size of the ejector can be obviously reduced, ejecting efficiency is improved, operation is stable, and adaptability is high; the ejector is simple in structure, easy to maintain and can be widely applied to multi-phase or single-phase pressurizing occasions.