The automatic bag mouth packing machine is suitable for automatic sewing of kraft paper bags and plastic woven bags. This machine adopts photoelectric control, which can automatically and continuously complete the functions of trimming the mouth of kraft paper bags and plastic woven bags, wrapping crepe paper, sewing, cutting thread braids and other functions. The height of the machine can be adjusted according to the size of the packaging bag, and it is equipped with two Frequency converter, so that the speed of sewing machine and folding machine can be adjusted freely.