The food industry is an important industry, directly related to consumers' lives and health. With the development of technology and economy, people's living standards are improving, the demand for food is increasing, and the quality of packaging also affects the safety of food. As the saying goes, diseases are imported from the mouth. Consumers not only have higher requirements for food, but also have higher requirements for food packaging. Therefore, the technology of hot melt glue machine is continuously improved. The hot melt glue machine can continuously select the appropriate spraying method according to the needs of customers. For small carton packaging, the hot melt glue machine can generally be matched with a cartoning machine, which automatically sprays glue at the two ends of the carton to realize the automation of food packaging.