The invention relates to a grooving cutter which comprises a cutter blade and a cutter body, wherein the cutter body comprises a supporting part and a clamping part, and a cutter groove used for mounting and dismounting the cutter blade is arranged between the supporting part and the clamping part; the clamping part is provided with a clamping part front end, a clamping part limiting end and a clamping part rear end, the clamping part front end and the clamping part limiting end are separated through a front narrow groove, and the clamping part rear end is separated through a rear narrow groove; both the clamping part front end and the clamping part rear end have independent elasticity, and the clamping part limiting end is positioned above the clamping part front end. The grooving cutter has the advantages of being simple in structure, stable in clamping and high in supporting intensity and realizes multipoint clamping positioning.