A packaging machine comprises a vertical mounting plate and a horizontal mounting plate fixed at an upper part of the vertical mounting plate. The horizontal mounting plate comprises a fixed frame that encloses an article binding workstation from left, right and above. The vertical mounting plate and the fixed frame are mounted on a packaging machine frame. The packaging machine also comprises a tape spool. A packaging machine core and a belt pre-feeding device are mounted on the horizontal mounting plate. The packaging machine core comprises a belt feeding and retreating and belt tensioning device. The belt feeding and retreating and belt tensioning device comprises a belt feeding and retreating mechanism and a belt tensioning mechanism. The packaging machine provides improvement in packaging quality, overall packaging efficiency and operation reliability.