The invention relates to a device for lubricating the cylinders of a roll stand, in particular for roll nip lubrication in a roll stand for strip-shaped rolling stock. A mixture made out of water and oil is produced by means of a mixing and spraying device (1). Said mixture is sprayed onto at least one of the cylinders (2) of the roll stand and/or to the surface of the rolling stock (3). The mixer and the spraying device (1) consists of an arrangement consisting of several nozzle mixer units (4), water being guided thereto by means of a first supply line (5) and oil being guided thereto by means of a second supply line (6).