Four-stage felt belt chain production line. This production line includes the first stage, sliding stage, picking table device: (first stage, felt belt, rapid independent belt change), cooling table device: (second stage, felt belt, rapid independent belt change), straightening Machine feeding device (third stage, chain + felt belt, quick and independent belt change), storage table device: (fourth stage, chain + felt belt, quick and independent belt change), sawing table device, aluminum profile straightening Machine, finished saw table and cut-to-length table.