This utility model relates to the field of antique building roof technology, specifically to an antique building roof with a limiting structure. It includes two side frames and a connecting unit. The connecting unit includes multiple purlins, two transverse ribs, a fixing seat, a sliding rod, a limiting plate, a spring, a lower pressure plate, a limiting post, a connecting frame, auxiliary components, and a limiting component. In use, one end of the upper tile is slid against the lower pressure plate, causing the limiting plate to compress the spring until the other end of the upper tile abuts against the limiting post. The spring's reaction force firmly clamps the upper tile. Then, the lower tile is placed between the purlins and hooked by the connecting frame. The auxiliary components improve overall stability, and the limiting component presses down on the top lower tile. This method limits the tiles near the bottom, ensuring
structural stability and preventing subsequent loosening of the tiles.