The present invention relates to a kind of supercharging device, which comprises: One frame body, which is being formed into a shape of
cylindrical tube, has one primary end and one secondary end respectively, wherein the port of said primary end is being formed into the serrated shape along with a plurality of
serration structures, however, the port of said secondary end has a smooth plane instead; one axial structure is being formed into the said frame body; there is also a plurality of blades, in which, each blade being formed into a trapezoidal-shaped blade has a upper plate and a lower plate respectively, therein the said upper plate is shorter than the said lower plate; in addition, the said plurality of blades and the said plurality of
serration structures have been formed into the same number, and the upper plate of each blade is being connected to each of the said axial structure, the lower plate is being connected to internal surface within the said frame body, and it is extended from the secondary end to the peak portion of said
serration structure of the said primary end, and each of blade is corresponding to each of serration structure; wherein, the said supercharging device will be able to
supercharge intake air and hence to improve the said engine's
horsepower by enlarging air inflow of the engine.