The invention discloses a machining method for die characteristic lines. A cutter with a spherical head is used for carrying out machining on a die according to cutter walking lines to form the characteristic lines, the characteristic lines deviate from a center line within a threshold value range, and the cutter walking lines of the cutter are parallel to the center line. The invention further discloses the other machining method for the die characteristic lines. The cutter with the spherical head is used for carrying out machining on the die according to the cutter walking lines to form the characteristic lines, the characteristic lines are segmented into multiple characteristic line segments, and in each characteristic line segment, the characteristic line segment deviates from a center line segment within a threshold value range; and in each characteristic line segment, the corresponding cutter walking line of the cutter is parallel to the center line segment. By the adoption of the machining methods for the die characteristic lines, the cutter walking lines of the cutter are adjusted to be roughly parallel to the characteristic lines, the linearity quality of the characteristic lines can be effectively improved, machining efficiency is improved, and the cutter can be replaced conveniently in the machining process.