The invention provides a smoke detector-linked fan control box. The smoke detector-linked fan control box comprises a switching power supply, a transfer switch and a sixth contact eduction forced exhausting loop, wherein a live wire end of the switching power supply is connected with an external power box through a second air switch; a zero line end of the switching power supply is connected to a zero line; an anode of the power supply is connected to a cathode of the power supply through a smoke detector and an intermediate relay; a local manual control circuit is educed from a second contact of the transfer switch; a temperature control circuit is educed from a fourth contact of the transfer switch; a forced smoke exhausting circuit is educed from a sixth contact of the transfer switch; a first contact, a third contact and a fifth contact of the transfer switch are respectively connected with one end of a third air switch, and the end point is connected with the zero line through a temperature and humidity detector and is also connected with the zero line through a second normally-opened contact and a signal lamp; the other end of the third air switch is connected onto a C-phase alternating current power cord between the first air switch and a first normally-opened contact of a contactor; certain ends of three contacts of the first air switch are connected with three-phase power of the power box; the other ends of the first air switch are correspondingly connected with the first normally-opened contacts of the contactor; the other end of the normally-opened contact is connected with a three-phase electric interface of the fan. According to the control box, the power supply of the fan can be cut off when fire behavior occurs.