The invention discloses a drawing method for cutting lines, which comprises the following steps: loading a circuit board wiring diagram, and obtaining a plurality of data about arches of cutting lines from the circuit board wiring diagram. The data about the arches of the cutting lines comprises initial point coordinates, ending point coordinates and center coordinates of the arches of the cutting lines. Furthermore, the invention can classify the arches of the cutting line based on the data about the arches of the cutting lines, and use the arches of the cutting lines which are classified inthe same group to draw connecting lines as cutting lines.