A fan module and a fan rail thereof are provided. The fan module includes a fan, two fan rails and a holder. The fan rails are respectively disposed at opposite sides of the fan, and each of the fan rails includes a main body and a ring-pull, wherein the ring-pull has a tab portion and a pivot portion, and the pivot portion is pivoted with a first end of the main body. The fan is installed in the holder through the fan rails. The fan is adapted to be drawn out from the holder in an unlock state by rotating the tab portion of each of the fan rails along the pivot portion with respect to the main body and applying a pulling force to the tab portion.