This machine is suitable for making various film-blowing bags such as vest bag, flat bag, garbage bag and supermarket bag etc. With the function of up-down two-layer bag-making, it is a kind of ideal equipment for every bag-making manufacturer to increase benefit. 　　The whole machine adopts microcomputer control and material-pulling by stepping motor(servo motor control system can be selected and euipped). 　　Arbitrary fixed-length, accurate and stable step photoelectric tracking, stopping automatically when the label is lost, photoelectric control feeding. 　　Automatic counting and settable counting alarm. 　　Automatic constant temperature makes the sealing of bag opening firm and smooth. 　　Two-layer once-through bag-making, low energy consumption and high output.