Device for exchanging an extrusion cylinder of an extruder, the extrusion cylinder consisting of several cylinder sections and at least one screw element, which is in the interior of the cylinder and is coupled with the driving unit of the extruder for the purpose of extruding, a frame-like carrier being provided, which carries the extrusion cylinder and over which the extrusion cylinder can be held at accommodating means, which are provided at the extruder, as well as at mobile transporting means, a movement mechanism being provided at the accommodating means and/or at the transporting means and enabling the extrusion cylinder to be moved in a direction perpendicular to the cylinder axis for exchanging the complete extrusion cylinder from the accommodating means to the transporting means and vice versa.