The form-fill-seal packaging machine is a multi-functional packaging machine. After the material enters the top of the packaging machine, the metering section sends the pre-measured products into the material channel one by one. When the roll-packaging material passes through the outer wall of the material channel, it is wound into a tubular shape by the former, and the longitudinal sealer welds and seals its longitudinal seam firmly. The transverse sealer completes the top seal of the packaging bag and the bottom seal of the next bag, forming two weld seams. Since the material channel is wrapped by the packaging bag, after the bottom seal is welded, the material can be directly fed into the bag, then it moves to another station to complete the top seal, and cuts it off with a cutter, thus completing the packaging process.