The present invention relates to a fan fixing bracket, which is used for fixing a fan on a fan frame in a machine shell, comprising a front frame, a blocking groupware and two frames at the two sides. The outer side of the front frame leans against the fan frame and the inner side is extruded with at least an inserting pillar used for inserting into a screw of the fan; the blocking groupware is formed at the top edge of the front frame and can insert into a blocking hole of the fan frame; wherein the blocking groupware is an arc plate shape structure which bends downwards from the top edge ofthe front frame and the hatch faces upwards; the frames at the two sides are respectively connecting the relative two side edges of the front frame and externally and vertically extend outwards from the inner side of the front frame; the two side frames are also parallel; wherein each side frame is provided with a positioning groupware used for limiting the fan keeping away from the front frame so as to clamp and fix the fan between the two side frames. The fan fixing bracket of the present invention mot only can dismount the fan rapidly, but also can improve the vibration problem of the fan.