The single-stage high-speed centrifugal fan is designed based on the three-dimensional flow theory, which is more in line with the flow law of the fluid. The efficiency of the impeller is greatly improved compared with the two-dimensional flow impeller widely used by the multi-stage low-speed centrifugal blower at present. The single-stage high-speed centrifugal fan adopts axial air intake and is equipped with an air intake pre rotation device in the front of the impeller, which reduces the air intake loss