Automatic bag mouth folding and sewing machine is suitable for automatic folding and sewing of kraft paper bags or plastic woven bag mouths. Processes such as edge, stitching, trimming and thread cutting. Its air supply system realizes thread cutting. The height of the machine can be adjusted according to the size of the package. It can be combined with a conveyor to form an automatic production line, which is widely used in food, feed, chemical and other industries.