The invention discloses a high-voltage booster, comprising an intermediate frequency motor, a moving impeller, a rectifier, an air intake cone and an air duct assembly. The rectifier is fixed on one end face of the intermediate frequency motor, and the moving impeller is installed on the motor shaft of the intermediate frequency motor. On the top, the intake cone is fixedly connected to the moving impeller, the air duct assembly includes an intake air duct and an exhaust air duct, the intake air duct is correspondingly sleeved with the intake cone and the moving impeller, and the exhaust air duct The air duct is correspondingly sleeved with the intermediate frequency motor, the moving impeller is composed of a first hub, a wheel disc and a moving blade, and the moving blade is an autonomous blade type with controllable diffusion, and the rectifier is composed of a second hub, a stationary blade and a motor The box is integrally formed, and the blade shape of the stationary blade is a curved-swept structure. The technical effect is: in this design, the basic gravity center stacking characteristics of the moving blades are not changed, so that the blade has the smallest creep amount in the long-term operation, so as to adapt to the design with small radial clearance, and the flow is controlled by static The sweep of the blades is ensured so that the impeller can maintain high efficiency characteristics.