The invention relates to the technical field of cooling tower auxiliary equipment, in particular to a hydrodynamic wind power propulsion device and a cooling tower wind power system. The hydrodynamic wind power propulsion device comprises a shell, a water inlet, a water outlet, a fan and an impeller, a water collector is arranged in the shell, two ends of the water collector are hermetically connected with two ends of the shell in an extending manner respectively, a plurality of water inlet holes are uniformly arranged axially along the periphery of the water collector, the impeller is arranged in the water collector, the water inlet is arranged on the side wall of the shell, the water outlet is positioned on the shell below the impeller, the fan is arranged on the upper portion of the shell, and the impeller is coaxially connected with the fan. In the cooling tower wind power system, water flow can generate vortex by the aid of the water inlet holes to push the impeller to rotate, the impeller further drives the fan to rotate, and ventilation requirements are met. Therefore, water flow is circulated only by the aid of surplus power of a water pump in a cooling tower, the fan can rotate without additionally consuming electric energy, and accordingly, energy is saved.