The invention discloses an ion wind collection device for a cooling tower. The ion wind collection device comprises a water collection device hung at the internal high part of the natural ventilation cooling tower of a thermal power plant through tightening ropes, wherein the water collection device consists of a plurality of water collection modules which are closely arranged and hung along the top of the cooling tower through ropes; each water collection module consists of a bracket and a plurality of water collection units of hexagonal-prism-shaped structures, and the plurality of water collection units are repeatedly connected in parallel and then attached on the brackets; a discharge electrode and a water collection electrode are arranged in each water collection unit; and the discharge electrodes are vertically arranged in the centers of the water collection units. The ion wind collection device can effectively recover evaporation water loss and wind blowing water loss of the cooling tower of the thermal power plant, reduces the running cost of the thermal power plant and brings about huge environment-friendly benefits.