The invention relates to the technical field of fire disaster ventilation and smoke discharging, and provides a fire disaster ventilation and smoke discharging method for platforms of a subway transfer station. The fire disaster ventilation and smoke discharging method includes the following steps that: when a fire disaster appears in a platform public area of one of the platforms in the subway transfer station, a preset smoke discharging and air supplying mode is started to form a stable air flow from the platforms and/or station halls where the fire disaster does not appear to the platform public area of the platform where the fire disaster appears through a transfer channel, and smoke discharging is conducted on the platform public area of the platform where the fire disaster appears; and the preset smoke discharging and air supplying mode includes a first smoke discharging mode, a second smoke discharging mode, a third smoke discharging mode, a fourth smoke discharging mode, a fifth smoke discharging mode, a sixth smoke discharging mode, a seventh smoke discharging mode and an eighth smoke discharging mode. According to the fire disaster ventilation and smoke discharging method, the diversity of the smoke discharging and air supplying modes is achieved, the working dynamic states of smoke discharging and air supplying fans of the different platforms for transferring are comprehensively used, the discharging efficiency of smoke in the fire disaster is greatly improved, the fire situation is controlled rapidly and advantageously, and the casualty and the property loss arereduced by the largest degree.