The present invention relates to a laser positioning system for an aperture-processing machine and is an accessory of an aperture-processing machine. The present invention is a type of laser positioning system for an aperture-processing machine that includes two laser transmission devices each of which emits a beam of light. The two light beams form an angular set up. A common line of intersection is formed at the point of intersection in space. After the two laser transmission devices have been fixed relative to the aperture-processing machine, the common line of intersection formed at the point of intersection of the two light beams mentioned above and the axial line of the main bearing cutter of the aperture-processing machine coincide exactly, thus forming the reference for positioning. In the application of the present invention, adjustment is easy, positioning is rapid and observation is direct with high accuracy and low cost. The device can be used widely in processing machines such as drilling machines, boring lathes and lathes.