An assembly structure for use in a storage media of server includes: a base, formed with an accommodation space for accommodating a storage media; and a rotary cover plate, one end thereof is rotatably pivoted on the base, and the rotary cover plate includes a top plate, a push plate and a force plate. The push plate and the force plate are oppositely arranged at two sides of the top plate. The rotary cover plate is able to be engaged relative to the base thereby enabling the force plate to push the storage media for being electrically connected to the base, or to be opened relative to the base thereby enabling the push plate to push the storage media for being disconnected with the base. Accordingly, the storage media is enabled to be easily assembled or detached.