Abstract: A stackable computer housing assembly includes at least two computer housings. Each of the computer housing has a frame body, two first sliding rails and two second sliding rails. The frame body has a top portion and a bottom portion. The two first sliding rails are assembled at the top portion of the frame body, and the two second sliding rails are assembled at the bottom portion of the frame body. Two of the computer housings slidably engage each other through the two first sliding rails and the two second sliding rails, such that the two computer housings are stackingly coupled. The first sliding rail, the second sliding rail and the frame body are independent pieces. The first sliding rail and the second sliding rail fixed to the frame body by assembly, to facilitate application on different computer housings, have preferred compatibility and reduced production cost.