The invention relates to a PP strapping machine which comprises a workbench and a film sealing mould arranged on the middle part of the workbench, wherein axial two ends, which correspond to the film sealing mould, of the workbench are provided with PP strap guiders in a mirrored manner; each PP strap guider comprises a guide plate, wherein a flat-strap-shaped guide hole for allowing a PP strap to pass through is formed in the corresponding PP strap guider, the middle part of the guide plate is movably connected to the workbench through an air cylinder mechanism; each air cylinder mechanism comprises an air cylinder mounted in the workbench; the end part of an air cylinder rod connected in each air cylinder is rotatably connected to each guide plate; the movable axis of each air cylinder rod is perpendicular to the surface of the workbench; one side, which corresponds to the axial end part of the workbench, of each guide plate is rotatably connected to a connecting rod, and the other end of the connecting rod is fixedly connected to the axial end part of the workbench perpendicularly; the film sealing mould comprises a base mould which is in front of the workbench and an extrusion mould which is movably connected to the workbench, wherein two groups of lifting air cylinders are further arranged in the workbench; and lifting air cylinder rods of the lifting air cylinders are fixedly connected to the axial end part of the extrusion mould separately.