An assembly structure includes a first body, a second body and a third body. The second body detachably disposed on the first body includes a first positioning portion and a first acting portion. The third body coupled between the first and second bodies includes a second positioning portion and a second acting portion. When the third body is switched to a first predetermined position, the second positioning portion of the third body is pressed against the first positioning portion of the second body along a reference direction, thereby positioning the second body at a first reference position. When the third body is switched from the first predetermined position to a second predetermined position, the second acting portion of the second body is pressed against the first acting portion of the second body, thereby moving the second body from the first reference position to a second reference position.