The working principle and characteristics of the fully automatic food packaging machinery: an intelligent temperature controller is used to control the horizontal and vertical sealing temperatures in two ways, so that the sealing is firm, the sealing performance is good, the belt shape is smooth and beautiful, and the packaging efficiency is high. The bag making system adopts stepper motor subdivision technology to automatically track and automatically locate the color mark of the bag, easily completing the bag making operation with fast adjustment and speed. Smooth operation and low noise. The advanced intelligent photoelectric system and automatic compensation function are used to ensure the automatic alignment of double-sided printing patterns on packaging bags and improve the utilization rate of packaging materials.