The invention relates to a
wind power generation device with the protective function. The
wind power generation device comprises a base, a
tower frame, an
engine room, a wheel hub and a plurality of fan blades; a power generation device comprises a speed-increasing gearbox, a first
electric generator, a reducing mechanism and a plurality of heat dissipating mechanisms; the reducing mechanism comprises a circular ring, a support component, a plurality of convex plates, a plurality of convex teeth and a plurality of air cylinders; each of the heat dissipating mechanisms comprises a heat dissipating
pipe, a cover plate, a filter screen, a driving component, a telescopic component, a second
electric generator and a gear; and the telescopic component comprises a bracket, a sliding plate, a movable plate, a spring and a limiting unit. Through cooperative operation of the reducing mechanism and the heat dissipating mechanisms, the
wind power generation device can reduce the rotary speed of agear when the wind power is stronger and does work to the second
electric generator through gear rotation for additional power generation; and at the same time, the cover plate is separated from the the heat dissipating pipes, so that the
engine room can conveniently carry out ventilation and heat dissipation, and the
wind power generation device generates
electricity in a safe, stable and efficient manner to improve the practicality of the
wind power generation device.