The utility model provides an RH ring brick clamping tool, and relates to a clamping tool. The tool comprises a left half ring (2), a right half ring (3), hoisting mechanisms, supporting bases and an adjusting locking mechanism. The left half ring (2) and the right half ring (3) are each of a half ring structure, one end of the left half ring (2) and one end of the right half ring (3) are connected through a hinge (1), the outside of the other end of the left half ring (2) and the outside of the other end of the right half ring (3) are each provided with one supporting base, the adjusting locking mechanism is arranged between the two supporting bases, and the hoisting mechanisms are arranged on the middle outer edge face of the left half ring (2) and the middle outer edge face of the right half ring (3) respectively. The left half ring (2) and the right half ring (3) are adjusted to be opened to meet the requirement for a required specification by adjusting a nut (10) on a lead screw (9) and four square rods at one end of the lead screw (9). After a ring brick is clamped, grinding of two end faces can be carried out, the use requirements of ring bricks of various specifications are met, operation can be finished only by one person, and work efficiency is effectively improved.