A constant-speed wind power generator including a plurality of wind scoops, at least two wind-catching cylinders, a fan, a vertical shaft, a steering gear, a first booster, a spring wheel, a second booster, an accelerator, a generator, and an iron tower. The first booster and second booster respectively comprise gears meshed with each other with diameters from small to large. The accelerator comprises a plurality of gear drive mechanisms with different diameters and the diameter of a driving gear of each gear drive mechanism is greater than that of a driven gear. The vertical shaft is disposed on the iron tower, and a plurality of the wind scoops are fixed on the vertical shaft. The fan is fixed on the vertical shaft corresponding to the wind-catching cylinders. The generator is capable of producing a stable power generation.