This automatic premade bag packaging machine is designed for peeled garlic cloves and frozen food, integrating Z-type elevator feeding, multi-head electrical weigher, horizontal bag feeding, ribbon coding, zipper opening, automatic filling, nitrogen filling, heat sealing, and finished product output. Equipped with a visual PLC touch screen, it allows direct adjustment of packaging weight and flexible bag size within parameter range, supporting multiple bag types such as zipper bags, flat bottom bags, and doypack bags. With high precision weighing, adjustable speed, famous electrical components, and optional vacuum function for granular materials, it ensures efficient, stable, and versatile packaging performance.