A shell body assembly structure includes a first shell body, a second shell body and a frame. A plurality of fixing portions is projectively disposed at the peripheral edge of the first shell body. A locking point is formed on each of the fixing portions. The second shell body has a plurality of holes corresponding to the locking points to lock the locking points so that the first shell body and the second shell body can be locked together. A plurality of openings corresponding to the fixing portions is disposed at the peripheral edge of the frame. A locking hook is formed on each of the opening. When the locking point is pressed down, the fixing portion can be pushed away and then locked with the locking hook, thereby separating the first shell body and the second shell body.