The invention relates to a clamp, in particular to a hard alloy roll ring surface grinding clamp, and aims to solve the problem that an electromagnetic chuck is easily damaged by a roll ring when the roll ring is machined in the prior art. The hard alloy roll ring surface grinding clamp comprises a baffle block which is used for limiting the roll ring to move along a horizontal surface; a backing ring which is absorbed on the electromagnetic chuck is arranged at the lower end of the roll ring. According to the hard alloy ring surface grinding clamp, the backing ring is arranged between the roll ring and the electromagnetic chuck, so that the electromagnetic chuck is prevented from being scratched because of the direct contact between the roll ring and the electromagnetic chunk; the backing ring is made of iron, so that the maintenance cost is low, and only 400 to 800 yuan is required for repairing and grinding each piece of backing iron; the cost is greatly reduced relative to the cost for the maintenance of the electromagnetic chuck.