The invention relates to a vertical permanent-magnet suspension single-stage high-speed centrifugal blower. The centrifugal blower comprises a volute, an upper bearing part, a rotation shaft, a motor rotor, a motor shell, a lower thrusting permanent-magnet bearing part, a support base, a bottom plate, an electric wire, a frequency converter, a motor stator, an impeller and the like. According to the vertical permanent-magnet suspension single-stage high-speed centrifugal blower, design is reasonable, the structure is compact, operation is reliable, and supporting is achieved through the permanent-magnet suspension bearing; the permanent-magnet suspension bearing can effectively reduce frictional losses in machine running and has the advantage of being long in life; the centrifugal blower can run at a high rotation speed and is cooled in the mode of introducing cooling water; the permanent-magnet suspension bearing bears upward axial aerodynamic force generated in running of the blower, an auxiliary bearing only bears radial centrifugal force generated in running, and therefore the life of the auxiliary bearing is longer than that of an auxiliary bearing in general application; the centrifugal blower can reduce energy consumption in the sewage aeration oxygen supply treatment link, achieves the environment protection effect and has a wide market application prospect.