A cooling fan with thermostatic air output has a water cistern and a water reservoir respectively disposed on the top portion and the bottom portion of the fan body, wherein an electric fan and two pipes of recycling pipe and water outlet pipe for water circulation are disposed therein; Wherein a Thermoelectric Cooling Modules (TECM) is secured in said water cistern, and a water absorbing curtain is hung downwards between the wind inlet of said fan body and said electric fan such that the top end of said water absorbing curtain being immersed in the water cistern; Then, by means of the sucking function of said electric fan in front of said water absorbing curtain, the air of normal temperature from wind inlet is sucked and blown out of the wind outlet via said water absorbing curtain, where the inlet air mixing with moisture of lower temperature; Thus, the cooling effect in breeze of lower temperature by blowing action is achieved so as to let us enjoy such cooling breeze.