Abstract: A wind power generator in which a rotating force of front and rear blades, which rotate in opposite directions to each other against the wind, enables a permanent magnet and a coil body to rotate in opposite directions so as to provide high efficiency of power generation, wherein at a low wind speed, according to the wind direction, the wind power generator freely rotates towards the wind so as to face the wind, at a middle wind speed the wind power generator is forced to rotate toward the wind so as to face the wind using power of a driving motor, and at a high wind speed the wind power generator is forced to rotate perpendicular to the wind using power of the driving motor so as to prevent the front and rear blades from breaking in a strong wind.