A mechanism driven by wind power to increase dissolved oxygen in water at least comprises a windmill mechanism, a water-drawing mechanism and a driving mechanism. The water-drawing mechanism is driven by the windmill mechanism drives via the driving mechanism. The windmill mechanism further comprises a pump. As such, the windmill mechanism not only can be driven by wind power but also can be driven by pressurized water flow generated by water pumping operation of the pump. When the windmill mechanism is operated, the water-drawing mechanism driven by the driving mechanism is synchronously rotated, and water from a pond is directly drawn to the air by the water-drawing mechanism and subsequently fallen back to the pond, thereby increasing contact area of water droplets to the air and achieving the purposes of effectively increasing dissolved oxygen in water and saving electrical energy.
