Double-layer, Six-line, Bottom Sealing Bag-making Machine has such functions as photoelectric automatic tracking microcomputer length setting, high limit stopping, automatic counting, automatic alarm on reaching the set value, high compensation accuracy with such characteristics as neatbags, little error and high automatic of whole machine, so it is a kind of ideal equipment for producing blank bags, colour bags, flat bags and vest bags, etc. And other various plastic soft packing bags.