The invention discloses a TBM disc cutter with the grooved cutter ring outer circumference. The TBM disc cutter comprises a cutter ring, a cutter body, a check ring, a bearing, a rigid mandrel, a bearing end cover and a seal ring. The cutter ring is fixed to the cutter body through the check ring, the bearing is connected into the cutter body, and the bearing end cover and the seal ring enable thebearing to be fixed to the rigid mandrel in a sealed mode. According to the TBM disc cutter with the grooved cutter ring outer circumference, a novel rock breaking disc cutter ring structure is used;the cutter body, the bearing and the bearing end cover are assembled to the mandrel, internal oil liquid is sealed by means of the seal ring between the cutter body and the bearing end cover, and a step is arranged on the outer ring of the cutter body and used for positioning the cutter ring; and by means of the TBM disc cutter, a compact core shape can be controlled, stress distribution is changed so as to form lateral cracks, production and extension of the lateral cracks are facilitated, the rock breaking energy consumption is reduced, the rock breaking capability is effectively improved,and the rock breaking efficiency is improved.