The invention discloses a hard disk assembling structure for assembling a hard disk device. The hard disk device comprises two first button parts. The hard disk assembling structure comprises a frame body, two elastic plate bodies and two slide bodies. The frame body comprises a joining arm and two suspending arms. Two opposite ends of the joining arm are respectively connected to two suspending arms. The two suspending arms are used for enabling the hard disk device to be installed between two suspending arms. One end of each of two elastic plate bodies is connected to two suspending arms, and the other end of each of two elastic plate bodies is provided with a second button part. Two slide bodies are slidably installed on two suspending arms respectively. The two slide bodies are slid relative to two suspending arms and provided with a locking position and a releasing position. While two slide bodies are located in the releasing position, two second button parts are normally separated from two first button parts; and while two slide bodies are located in the locking position, two second button parts are locked on two first button parts, so that the hard disk device is rapidly assembled and detached.