A direct current induced draft fan includes: a volute, a wind wheel, a motor, and a locking assembly. The motor includes a motor body and a motor controller. The motor is disposed on the top of the volute, and the wind wheel is disposed in the volute. The motor is configured to drive the wind wheel to rotate. The motor controller is disposed on one side of the motor body and is fixed on the motor body through the locking assembly. The side wall of the motor controller extends from the motor body towards the volute.