A housing for a centrifugal fan includes a surrounding wall extending upwardly from a periphery of a bottom wall with an air inlet, and including a surrounding wall body defining an opening, a protruding wall body extending outwardly from the surrounding wall body, corresponding to the opening, and having a dust-discharging hole, and a shielding plate disposed on the protruding wall body. The surrounding wall body and the bottom wall cooperatively define an accommodation space communicated with the air inlet, and an air outlet communicated with the accommodation space. The protruding wall body, the shielding plate, and the bottom wall cooperatively define a turbulence space communicated with the accommodation space. The shielding plate is movable between a closed position to close the dust-discharging hole, and an open position to open the dust-discharging hole so as to permit fluid communication between the turbulence space and the outside environment.