A machine cabinet fan control method is implemented through a machine cabinet fan control module. The module is suitable for controlling a plurality of fan sets each corresponding to a heat-dissipating area, and comprises a machine cabinet management controller and a plurality of area control units. The method comprises the steps that each area control unit receives a temperature datum from a corresponding connected server; each area control unit detects whether the machine cabinet management controller normally operates or not; as for each area control unit, if the detecting result is normaloperating, the rotating speed of the fan set corresponding to the area control unit is controlled by the machine cabinet management controller; and if the detecting result is abnormal operating, the area control unit controls the rotating speed of the corresponding fan set according to the received temperature datum, and thus two-stage-type fan control is achieved.