A cooling fan housing assembly for assembling to a heat sink includes a boosting portion and a connecting portion extended from the boosting portion. The connecting portion includes a first part and a second part for covering on and fixing to the heat sink. The second part of the connecting portion is provided with at least one hooking section for firmly hooking to the heat sink, so that a cooling fan supported on the cooling fan housing assembly can be quickly assembled to the heat sink without the risk of producing vibration during the operation of the cooling fan. Therefore, the cooling fan housing assembly not only reduces assembling labor and time and manufacturing cost, but also enables stable operation of the cooling fan.