The machine is specially manufactured for making colour-printed ethylene or propylene bags, flat opening bags, and vest bags. Adopting the strong point of machines of the same kind in the world, the machine is the mechanical-electrical intergration bag-making machinery with many functions, Step motor driving makes tension control more stable, and bag number more exact. Hot sealing temperature is automatically controlled, which ensure bags to be steady. The machine and automatic starting, stopping, sealing, cutting, counting, blinding, and waning.