The invention discloses a roller clearing device of a cold-rolling unit. The roller clearing device comprises a casing, wherein a rotating shaft is arranged in the casing, a rotating roller penetratesthrough the rotating shaft, a mounting block is arranged on the casing, a clamping device is arranged in the mounting block, a mounting rod is connected with the mounting block through the clamping device, an oblique scraper is rotationally connected onto the mounting rod and props against the surface of the rotating roller, a first mounting groove is formed in the mounting block, a first springis connected onto the inner side wall of the first mounting groove, and a vertical scraper is connected with the other end of the first spring. The roller clearing device is simple in structure and easy to operate, the mounting rod and the oblique scraper are convenient to mount and dismount under the interaction of the clamping device and other structures, so that a lot of time is saved during maintenance and assembly; the vertical scraper and the oblique scraper can be closely attached to the rotating roller under the interaction of the first spring, a spring rod and other structures, the scrapers are not required to be adjusted, and the roller clearing device is convenient to use.