The utility model relates to an industry moisture content control technical application field. Its purpose provides a simple structure's rotary dehumidifier for wind generating set, can effectively reduce the inside humidity in generating set cabin, can reduce operating power consumption in a large number simultaneously, increases and imitates in dehumidification disposition of equipment year, and move convenient operation. A rotary dehumidifier for wind generating set, one side of dehumidifier box is equipped with the air intake panel, and the opposite side is equipped with the air outlet, and inside still is equipped with a processing fan, dehumidification runner and regeneration wind heating device, the two wind channels of external connection in the processing region of dehumidification runner are connected to the air outlet and the wind heating device that regenerates respectively, and regeneration wind heating device feeds through to the regeneration zone of the runner that dehumidifies, and the regeneration zone is connected to regeneration wind through regeneration wind exhaust pipe and exports, regeneration wind export intercommunication extremely the outside in generating set cabin, the intussuseption of dehumidification runner is filled with high -efficient moisture absorption dielectric material.