Laser processing technology is the main application of laser technology in industry, providing a new means of modern industrial processing technology, which has a great impact on industrial development. Laser processing technology and application of rapid development, laser welding, laser marking, laser drilling, laser heat treatment, laser rapid prototyping, laser tinting and so on. Accounting for more than 70% of the entire laser processing industry. The topic is mainly to introduce the laser principle, laser cutting technology and laser technology development history, so that there is a basic understanding of laser cutting.