The invention provides a contra-rotating impeller ventilating driving device, solving the shortages of poor performance, low radiating performance and inconvenient repair of the existing contra-rotating impeller ventilation device, as well as enabling two groups of impellers to be closest to each other under a bevel gear driving condition so as to achieve contract structure and high efficiency. The contra-rotating impeller ventilating driving device is that flanges output to a first-stage impeller and a second-stage impeller to achieve the contra-rotating of the impellers; tapered roller bearings are arranged at both ends of a cross shaft and can run at a high speed, so that the requirement on high rotating speed of the impellers can be met. The contra-rotating impeller ventilating driving device is a keel type driving housing, the cross shaft is used as the main body, and the housing only bears a supporting force from the longitudinal shaft end of the cross shaft; therefore, the contra-rotating impeller ventilating driving device has the characteristics that the structure is simple and compact, and the driving efficiency is high.