A fastening module for fastening a data storage device is provided. A fastening trough is formed at a lower surface of the data storage device. The fastening module includes a frame bracket, a fastening member, and a buckling member. The frame bracket is used for carrying the data storage device. The frame bracket includes a lower frame and two side frames. The side frames are connected to two sides of the lower frame. The lower frame includes a clamping hole. The fastening member is disposed at the clamping hole and inserted into a fastening trough, so as to prevent the data storage device from moving. The buckling member is movably disposed at the side frames to buckle an upper surface of the data storage device.