Roll grinder

The invention relates to a roll grinder, and relates to the technical field of metal rolling, in order to solve the problem that the machining period of a roll is long due to multiple times of replacement of grinding wheels, the roll grinder comprises a movable grinder, a grinding wheel mounting frame is arranged on the movable grinder, a plurality of mounting rods and a plurality of grinding wheels are arranged on the grinding wheel mounting frame, and the grinding wheels are the same in size. The surface abrasive particles are different in fineness, the multiple grinding wheels are rotationally connected to the corresponding mounting rods correspondingly, and a driving assembly is arranged on the movable grinding machine; the ends, close to the grinding wheels, of the mounting rods are connected with matching wheels, the matching wheels are coaxially and fixedly connected with the corresponding grinding wheels, annular grooves are formed in the matching wheels, the matching wheels are connected with elastic