The wind power generation system comprises a generator, a shaft, at least one leaf group and at least one wind-guiding structure. The generator includes a rotor, and the shaft is connected to the rotor. The leaf group includes a movable barrel, at least one first blade, at least one propeller blade, a plurality of pressurized channels, a first vortex chamber and a decompression chamber. The movable barrel is movably sleeved on the shaft. The first blade is connected to the activity barred. The propeller blade is connected to the movable barrel and above the first blade.