The invention relates to the technical field of bag making machines, and discloses an automatic bag making
machine and a bag making method thereof. The automatic bag making
machine comprises a bottom plate and wound films, wherein a supporting plate is fixedly arranged on the upper surface of the bottom plate, two winding rollers are rotationally arranged on the outer surface of the supporting plate, and the two winding rollers are the upper film winding roller and the lower film winding roller correspondingly; and a stepping structure is arranged on the upper surface of the bottom plate, a heat sealing mechanism is arranged on the upper surface of the bottom plate, a trimming mechanism is arranged on the upper surface of the bottom plate, and a
cutting mechanism is fixedly arranged on the upper surface of the bottom plate. According to the automatic bag making
machine and the bag making method thereof, a sixth air cylinder is arranged, the sixth air cylinder drives a
cutting tool to move downwards, and the wound films are
cut one by one along a heat sealing trace of a second heat sealing strip according to the working requirement, so that packaging bags are formed; and the width and length of the produced packaging bags can be adjusted according to the working requirement, so that
size adjustment is flexible and diversified, different working requirements can be met, the production range of the device is expanded, and the economic benefit of the device is improved.