In a roller adjustment apparatus for an extrusion mill, comprising a cylindrical die (2) with radially extending extrusion channels and a number of rollers (1) within the die, rotatable about their axes and co-operating with the die to press material to be treated through the extrusion channels in the die wall, the adjustment apparatus comprises eccentrically journalled bearing shafts (3) for mounting the rollers (1), said eccentrically journalling of the shafts (3) providing a radial adjustment of the position of the rollers (1) relative to the die (2), the rotation of the eccentrically journalled shafts (3) is provided by means of extension arms (6) fixedly mounted on the ends of the eccentrically journalled shafts (3), and said extension arms (6) being connected to an axially movable connection element (8) by means of articulated connected linkage rods (7), and said connection element (8) being connected to a rod (9) provided with its axis in the axis of the die (2) and extending to a position outside the material flow of the extrusion mill to move the connection element (8) in the direction of the axis of the die (2), said axial movement being provided manually or by means of a suitable actuator connected to the rod (9). In this way, only simple mechanical components, such as linkage rods (7) and connection elements (8) are positioned close to the rollers and these components are moved by manual adjustment or by means of suitable actuators positioned outside the aggressive environment close to the rollers of the extrusion mill.