A heat-dissipating assembly includes a plurality of heat-dissipating devices, each of which includes a frame having at least one locating window for allowing the heat-dissipating device to inhale air and discharge airflow, and a stream-guiding wall formed beside the locating window; and at least one blade structure mounted in the locating window of the frame. In addition, each heat-dissipating device further includes at least one engaging medium to be engaged with a corresponding engaging medium of another heat-dissipating device, thereby allowing the plurality of heat-dissipating devices to be combined in parallel, side by side, or in tiers.