At present, most electronic products, such as the main board of the mobile phone, computer and other key elements have identifications of traceable information. At the present stage, it is commonly adopted the ink label paper to stick on the product. However, such a mean has many problems, big amount of consumables, high pollution, high labor cost, the marks are easy to be eliminated and so on. Aimed at such condition, replacing the label paper by the laser marking code has become a tendency of the industry. With the automatic PCB laser marking machine, bar code, two-dimension code and character, pattern and other information can be marked on the printing circuit board and the relevant components.