The utility model discloses an anti-floating structure applied to a cooling tower, and belongs to the technical field of cooling tower systems. Wherein the upper linear air duct, the middle arc-shapedair duct and the lower linear air duct are communicated, and a plurality of air ducts are adjacently connected to form an anti-floating blocky ventilation body. The utility model has the benefits asfollows: water drifting is effectively prevented, the waste of water resources is reduced, and the utilization efficiency of water resources is improved; ice hanging of fan blades at the top of the cooling tower in winter is prevented, collision caused by ice hanging operation is avoided, and operation stability of the cooling tower is guaranteed.