A storage server includes a case, an adapter board, a control board module, a power supply module, a plurality of hard disk units, a plurality of dividing boards, and a case cover. The adapter board divides the case into a first space and a second space. The control board module and the power supply module are disposed in the first space and electrically connected to the adapter board. The hard disk units are disposed in the second space, and the hard disk backboards thereof are connected to the adapter board via cables. The dividing boards are used to separate the hard disk units. The second space and the hard disk units disposed therein are covered with the case cover.