On-line cleaning device for gravure roller

The invention discloses an on-line cleaning device for a gravure roller. The device comprises a printing machine, wherein the printing machine comprises two supports which are symmetrically and vertically installed and a concave roller rotationally connected between the two supports; a cleaning device is vertically connected between the two supports in a sliding manner; the cleaning device comprises a curved plate attached to the upper surface of the concave roller and sliding blocks connected with the two supports in an up-down sliding mode, a horizontal screw rod is rotationally connected between the two sliding blocks, and the curved plate is in threaded connection with the horizontal screw rod and is coaxially arranged with the concave roller; the cleaning device comprises an extrusion disc which is coaxially installed with the horizontal screw rod, and the extrusion disc can be attached to the upper surface of the concave roller; and a lifting frame which is vertically and slidably connected is installed