The invention discloses a method for eliminating residual thermal stress of a hard alloy cutter. A hard alloy cutter sample is subjected to flatness treatment and then mounted in a cold-pressing mold; the cold-pressing mold containing the hard alloy cutter sample is charged into a press to be pre-pressed, after pressure maintaining, two times of pressing pressure increasing are conducted until the pressure reaches the maximum set value, and pressure is unloaded in two steps after pressure maintaining; and the pressure increasing speed and the pressure decreasing speed are controlled, and pressing is repeated for 8-12 times with same pressing parameters. The side face of the pressed hard alloy cutter sample is changed to a stressed face, the pressing load is changed according to the same pressure intensity, operation is repeated with the same pressing parameters, the sample is taken out after pressing is completed, and the low-internal-stress hard alloy cutter is obtained.