Abstract: The present invention provides a wind-driven rotary device disposed on a wind power generator, and particularly a wind-driven device with vertical vanes that provide effects of wind deflection, omni-direction and wind collection. The wind-driven device is characterized in that: upright columns are disposed above the wind power generator, vertical arc-shaped rotary vanes are disposed at a central position among the upright columns, and each of the upright columns is provided with an arc-shaped wind deflector that is inclined inwards on an inner edge thereof. In implementation of the present invention, a wind collector may be additionally provided on an outer edge of each of the upright columns to increase volume of the wind so that a larger torsional force can be generated by the vanes of the wind-driven rotary device to deliver a better effect of wind power generation.