The invention discloses a paper tube pressing machine which comprises an outer roller and an inner roller, wherein the outer roller comprises two semicircular outer rollers which can be spliced to form a hollow cylindrical roller, two sides of the semicircular outer rollers are respectively and fixedly provided with a clamping-connecting plate, the clamping surface of each clamping-connecting plate is in zigzag embossment, and the clamping-connecting plates are arranged on the outer surfaces of the semicircular outer rollers; the inner roller comprises two semicircular inner rollers which can be spliced to form a hollow cylindrical roller, two sides of the semicircular inner rollers are respectively and fixedly provided with the clamping-connecting plate, and the clamping-connecting plates are arranged on the inner surfaces of the semicircular inner rollers; one end of the outer roller is provided with a fixed extension plate which is connected with a motor through a transmission component; a floor stand is arranged below the outer roller, the periphery of the outer roller is provided with a rolling bearing, and the rolling bearing is supported on the floor stand. The paper tube pressing machine disclosed by the invention is simple to operate, a paper tube is transmitted to go forward through mutual extrusion of the inner roller and the outer roller as well as the rotation of the outer roller, so that the paper tube is tightly pressed, the connection of each layer of paper is tight, the hardness of the paper tube is improved, and the thickness of the paper tube is reduced.