The invention supplies a vehicle heat emission fan structure that the section of internal flow channel is less than the section of wind intake end and the wind outlet end. It supplies vehicle using bubbling cotton that has a hatch, which has three holes: the first hole and the second hole have the same size as wind outlet end and wind intake end. The fan could be contained in it. The third hole could be designed to contain the wind intake end. When rotating a certain angle, it would be blocked at the brim of the hole and can't randomly move.