The invention provides a roller press and belongs to the technical field of machines. By adoption of the roller press, the problems that existing roller presses are inconvenient to use and incapable of processing materials with small diameters or large lengths are solved. The roller press comprises a box, a connecting mechanism, a rolling device and a steel frame. A maintaining sleeve is internally provided with a plurality of mounting grooves around a second channel, and a roller pin is fixed into each mounting groove in a clamped mode and can rotate around the central axis of the roller pin. During work, the maintaining sleeve continuously rotates, the roller pins can conduct rolling processing on the surfaces of materials when the materials pass through the roller pins, and accordingly the effect of rolling processing on the materials is achieved by the roller press; and secondly, the diameter of the inner circle of the second channel is changed by replacing maintaining sleeves of different specifications, so that the roller press can process the materials of different diameters.