An automatic bagging machine contains: a delivery mechanism, a film transporting mechanism, an ultrasonic cutting mechanism, an electric eye mechanism, a limiting assembly, a clamping mechanism, an air tube assembly, and a pushing mechanism. The delivery mechanism includes a conveying belt and plural fixing mounts on which plural spinning bobbins are fitted. The film transporting mechanism includes two carrying sets, each having a holder on which a film material is fitted. The ultrasonic cutting mechanism includes two cutting sets, two slide rails, two first power motors, and two film cutting sets. The electric eye mechanism includes two support posts, the limiting assembly includes a circular ring and an affix mount, the clamping mechanism includes a clamp portion, a crank shaft, and a second power motor. The air tube assembly includes a first air tube and a second air tube. The pushing mechanism includes a rolling assembly and a transmission assembly.