Straw harvesting round bale bundling machine

The utility model discloses a straw harvesting round bale bundling machine which comprises a rolling shaft and a base plate with walking wheels, a first installation plate and a second installation plate which correspond to each other are arranged on the upper end face of the base plate, and corresponding installation grooves are formed in the opposite faces of the first installation plate and the second installation plate. Mounting grooves are formed in the base plate, rotating columns are movably connected into the mounting grooves through rolling shafts, three corresponding through grooves are formed in each rotating column at equal angles, a conveying groove, a baling groove and a first material returning groove which correspond to the through grooves are formed in the first mounting plate, a second material returning groove corresponding to the first material returning groove is formed in the second mounting plate, and a material conveying device is arranged above the base plate; extrusion devices are ar