Energy-saving cyclone dust collector

The invention discloses an energy-saving cyclone dust collector. The energy-saving cyclone dust collector comprises a separating barrel, wherein the separating barrel comprises an upper cylindrical barrel body and a lower inverted-conical barrel body; an air inlet pipe is tangentially mounted on the cylindrical barrel body; a cylinder opening in the bottom end of the inverted-conical barrel body is a powder outlet; an inner separating barrel is coaxially arranged in the cylindrical barrel body; an annular cavity is formed between the inner separating barrel and the cylindrical barrel body; anexhaust pipe is arranged in the separating barrel; the upper end of the exhaust pipe coaxially extends into the inner separating cylinder; the lower end of the exhaust pipe is bent, then led out of the inverted-conical cylinder body and connected with an air inducing device; and an air guiding and dust blocking plate capable of guiding inlet air of the annular cavity into the inner separating barrel and preventing dust in