The invention discloses a cooling fan, comprising a fan frame, at least one fixed element and an impeller. The fan frame is provided with a plurality of through holes. The fixed element is distributed and arranged in one of the through holes. The fixed element comprises at least one positioning hole and at least one buffer part. The buffer part adjusts and arranges an elastic space in the throughholes of the fixed element. The impeller is arranged in the fan frame. As the cooling fan adopts the fixed element with the buffer space and the fixed element is provided with the buffer part and a rib, the fixed element generates no deformation which is caused by the extrusion and generates no looseness which is caused by non-matched dimension of the element.