The present invention relates to a roll grinder, The approximately central portion in the leveling cylinder 206 is provided towards the vertically upward, the right and left both sides of the left and right frames (208 209), the lower frame 207 is installed opposing each having a substantially "U-shaped cross-section's inner side; Approximately has a top side shape of the "b" shape is installed between the left and right frames (208 209), and that vertically moves the guide, the bottom central portion is coupled the cylinder rod of the leveling cylinder 206 is fixed receive provide upper and lower movement force , the upper side is formed substantially extends to the protruding portion of the rectangular groove surface required the leveling frame 201 is formed so that the top surface of the protrusion has a bottom surface outer circumference of the choke 102 can be seated; Is seated on the projection opposite to a top of the leveling frame 201, the possible binary sliding movement forward and backward by a forward-reverse cylinder 204 fixedly installed on the side face of the leveling frame 201, and seating the outer bottom surface of the opposite side of the choke 102 It can be to another groove surface required to move the frame (202) formed in the upper side; Grinding machine 107 is installed in the driving rotary part, the worm 304 rotates the motor 301 is installed on the end of the drive shaft arranged in the same direction of the roll is mounted; And it formed in an approximately cylindrical shape having the same direction as the roll is mounted, grinding machine (107) driving the drive gear 320 and the rotating frame to receive a rotational force formed gear portion along the outer circumferential surface engaged with the rotating portion inside the drive provided to the motor 311 of the (306 ); And two opposite installed inside the rotary frame 306, a guide plate 314 for holding the roll neck in the interior during the grinding operation while being guided by the connecting rod 317 is installed substantially in the center to move opposite to the inside or outside; And wherein the worm (304) and meshing with the worm gear (315a) formed in the central portion, is a respective guide plate through and joined to threads in opposite directions to each other to 314 formed on both sides of this center, the rotary motor (301) when rotated by the driving force that the screw (315) providing a driving force for opposing movement of both the guide plate (314); and comprises a, Sikimyeo reducing the risk of collision and the conductive roll and the risk of collision and when sanghacha with various equipment that can be generated in the process of moving the assembled choke, to prevent the equipment trouble was caused in the decomposition process of the roll and the chock. Roll grinding machines