A motor driving circuit capable of outputting a dual FG signal includes a control unit, a first Hall unit, a second Hall unit and a logic unit. The control unit is electrically connected to the first Hall unit and configured to generate a first FG signal based on a Hall signal sent by the first Hall unit. The second Hall unit is configured to detect the change in magnetic fields to generate a second FG signal to the logic unit. The logic unit is electrically connected to the control unit and the second Hall unit. The logic unit is configured to perform a logic operation based on the received first and second FG signals to convert them into a dual FG signal for an external system. With the control unit, the first Hall unit, the second Hall unit and the logic unit being integrated in the motor driving circuit, the convenience in use can be improved greatly. Furthermore, the working hours and the production cost can be reduced.