The wind turbine is disclosed. Wind generator according to an embodiment of the present invention is a pitch bearing enable the pitch angle control of the blade interposed between the blade and the hub, the main electric power supply unit for applying power to the wind turbine; And it rotates with the hub, an auxiliary power supply that generates power by using the rotational energy of the hub; By applying a rotational force to the pitch bearing pitch control to control the pitch angle of the blade motor; Switch to any of the control to be applied to the pitch adjustment motor of the main electric power of the power and the auxiliary power supply of the electric power supply; And the main power supply in normal operation power is applied to the pitch-adjusting motor, the state is the power of the power supply electric power of the auxiliary power supply in an emergency situation can not be applied to the pitch adjustment motor control unit for controlling the switch to be applied to the pitch adjustment motor the portion includes the auxiliary electric power supply, a secondary generator which is located in the inner hub; And a rotation power to the energy transmission to the secondary transfer portion of a hub dynamo, and a power transmission unit, one end is fixed to the hub outside the rotation is restricted, the first gear is fixedly coupled to the other end fixed shaft; And it rotates with the hub inside the hub, and a second gear meshing with the first gear, the auxiliary generator is connected with the second gear, by using the rotational energy of the second gear to rotate relative to the first gear the production of electricity.