Abstract: A compressible combined packaging box comprises a threaded cup (1) which includes a threaded zone (1-1) with a stretchable height, a box body (1-2), a support ring (2), an inner bag support piece (3), and an insulated lid (7). The threaded zone (1-1) and the box body (1-2) are an integral molded part; an advertising section (8) is stuck on the outer_wall of the box body (1-2), an inwardly concave fixing groove (10) is arranged on the middle part of the box body (1-2), and a hidden picture and text zone (9) is provided on the outer_wall of the threaded zone (1-1); the support ring (2) is fixed on the lower edge of the inner wall of the advertising section (8) and is provided with three compressed tabs (2-1) and perforated lines (2-2); and the inner bag support piece (3) is fixed inside the bottom of the box. When the threaded zone (1-1) is elongated upwards, the inner bag support piece (3) is blocked in the fixing groove (10), thus the overall height of the packaging box can be stretched.