Ring groove cutter

The utility model provides an annular groove cutter, which relates to the technical field of cutting tools, and comprises an annular supporting seat, a connecting block and an annular groove cutter, one side of the annular supporting seat is vertically provided with a connecting rod, and the connecting rod and the annular supporting seat are coaxially arranged; the connecting block is detachably arranged on the side, away from the connecting rod, of the annular supporting seat, a first clamping piece and a second clamping piece are arranged at one end of the connecting block in a spaced mode, the first clamping piece is provided with a clamping groove, the second clamping piece is provided with a clamping block, and a limiting structure is further arranged between the first clamping piece and the second clamping piece; an abutting surface attached to the clamping block and a convex surface matched with the groove are arranged at one end of the annular groove cutter, and the cross section of the other end of t