An anti-disassembly device includes a first part including a first through hole; a fixing element affixed to the first part; a bolt movably disposed on the fixing element; an elastic element between the fixing element and the bolt; a second part in contact with the first part and having a second through hole; and a nail movably disposed in the first through hole and the second through hole. The nail has a lock groove. In a locked state, the nail is engaged with the first part and the second part, and the bolt is located in the lock groove and prevents the nail from rotating relative to the first part. When the nail is rotated to an unlocking position, the nail allows the first part to separate from the second part.