Cabin ventilation method and device for improving safety of wind driven generator

During ventilation, a ventilation fan (2) pumps outside air from a ventilation opening of a wind driven generator cabin (1), the outside air is dehumidified through a first dehumidification net plate (41) or a second dehumidification net plate (42) inserted into the inner side of a ventilation plate frame (4) and then flows to generator set equipment, and meanwhile air in the cabin is exhausted outwards; when a temperature and humidity detector senses that the humidity is high, a ventilation plate frame (4) moves, a dehumidification net plate on the other side moves to a ventilation opening of a wind power generator cabin (1), at the moment, the dehumidification net plate saturated in moisture absorption enters a drying cavity (36) in one end of a drying cover (3) and is heated and dried through an infrared heating lamp tube (5), the two sets of dehumidification net plates are convenient to alternately dehumidify, and the drying efficiency is improved. Persistent dehumidification of the ventilation device is