A finned air-guiding heat-dissipating structure includes a heat sink having heat-dissipating fins arranged at intervals. At least one heat-dissipating channel is formed between the heat-dissipating fins. The heat-dissipating fins form an intake side and a first exhaust side and a second exhaust side in communication with the intake side through the heat-dissipating channels. The first exhaust side and the second exhaust side are located on both ends of the intake side and on both sides of the heat sink. A first exhaust trough and a second exhaust trough are provided on the other two sides of the heat sink and in communication with the intake side through the heat-dissipating channels. The heat sink is connected to a fan to form a heat-dissipating module. With this arrangement, the heat sink can guide airflow toward plural sides, so that the heat can be dissipated outside rapidly to achieve an excellent heat-dissipating effect.