The invention relates to a mechanism for increasing dissolved oxygen in water driven by wind power, comprising a windmill mechanism, a water drawing mechanism and a driving mechanism, wherein the windmill mechanism drives the water drawing mechanism through the driving mechanism,the windmill mechanism also comprises a pump so as to make the windmill mechanism not only be driven by wind power but also be driven by the pressure water flow generated by drawing water through the pump,and when the windmill mechanism revolves, the water drawing mechanism rotates synchronously driven by the driving mechanism,the water drawing mechanism is used for directly drawing the water in a pool to the air and to drop the water into the pool so as to increase the contact area between the water drops and the air, thus achieving the aim and demand for effectively increasing the dissolved oxygen in water and saving electric energy.