The utility model discloses a knife milling machine, comprising a knife pedestal, a knife pedestal main shaft, a blade clamping plate, a grinding wheel, a motor connected with the grinding wheel and a motor pedestal capable of moving horizontally and vertically. The utility model is characterized in that a turntable is arranged between the motor and the motor pedestal; the motor is fixed on one surface of the turntable, and the center of the other surface of the turntable is provided with a positioning hole, or the shaft edge thereof is provided with a fixing hole and is connected with the motor pedestal; the position of the motor pedestal corresponding to the central positioning hole of the turntable or the shaft is provided with a positioning shaft or a hole, and the position of the motor pedestal corresponding to the fixing hole at the edge of the turntable is provided with a circular arc-shaped groove which is internally provided with a bolt which is capable of sliding in the circular arc-shaped groove and penetrates through the fixing hole at the edge of the turntable. The utility model adopts the structure, the turntable is additionally arranged, so that the grinding wheel can be in any angle for grinding the inclined surface and sharp mouth of a separating cutter; when clearing up the separating cutter, people do not need to assemble and calibrate the separating cutter again, and the time and labor can be saved.