A mounting mechanism for assembling a storage device includes a fixing member, a rotary member rotatably connected to the fixing member, and a pair of brackets extending from the fixing member. A resisting face is formed at a lateral side of the rotary member for engaging with the storage device. The pair of brackets are parallel to each other. A space is defined between the brackets for accommodating the storage device. A sliding groove is defined in each of the brackets. The sliding groove includes a split and an opening intercommunicating the split and on a side. The opening is closer to the fixing member relative to the split.