The invention belongs to the field of heat treatment, and particularly relates to a heat treatment process for a high-performance disc cutter of a TBM. The heat treatment process comprises the following steps: 1, carrying out annealing treatment after steel forging; 2, carrying out double-refining heat treatment process before tempering, specifically, heating a forge piece to 1030 deg C-1060 deg C, keeping the temperature for 2 hours-3 hours, repeating the process, heating to 850 deg C-870 deg C and keeping the temperature for 2 hours-3 hours, cooling to 730 deg C-740 deg C and keeping the temperature for 4 hours-5 hours, and carrying out furnace cooling; and 3, carrying out quenching treatment, specifically, heating the workpiece to 1030 deg C-1060 deg C, keeping the temperature for 2 hours-3 hours, and carrying out oil quenching, then carrying out tempering treatment, specifically, heating the workpiece to 540 deg C-560 deg C, keeping the temperature for 1.5 hours-2.5 hours, carrying out air cooling to the room temperature, and repeating the tempering treatment for one time. According to the disc cutter of the TBM obtained through the process, carbide is fine and is distributed on a substrate in a dispersed mode, a grain size is uniform and fine, and the carbide and the grain size are subjected to the double-refining; and the disc cutter has high hardness, and good wear resistance and impact resistance, and the service life of the disc cutter is effectively prolonged.