Sunken carton stacking and conveying device

According to the sunken carton stacking and conveying device, cartons are conveyed to a vertical lifting table through an external carton gluing machine, after the set number of cartons is reached, a horizontal supporting frame horizontally moves to the position above a bottom conveying belt to receive materials and slowly moves downwards, a horizontal pressing frame moves downwards to jointly extrude the cartons with the vertical lifting table, and the cartons are stacked and conveyed to the vertical lifting table. When the paperboards reach the bottom conveying belt, the temporary supporting device extends out to lift the paperboards, the horizontal supporting frame and the horizontal pressing frame synchronously move backwards along with the paperboards and convey the paperboards to the position between the top guide roller frame and the bottom conveying belt to be conveyed backwards, the vertical lifting table lifts the paperboards again, and the temporary supporting device retracts to enable the paperboa