The heat shrink wrapping machine is a new type of automatic overlay sleeving and sealing heat shrink wrapping machine with arbitrary combination, which belongs to the sleeving and sealing heat shrink wrapping machinery. It has a feeding support frame, on the upper end of which are installed the lower conveyor belt and the upper conveyor belt; the front end of the feeding support frame is connected with an overlay feeding support frame, and the front end of the overlay feeding support frame is the sleeving and sealing mechanism; near the upper and lower conveyor belts on the overlay feeding support frame, there is a lifting workbench, with flipping blades set on both sides of the upper end of the lifting workbench, and a flipping start motor on the top of the lifting workbench; in the middle of the overlay feeding support frame is the overlay workbench; on the upper side edge of the overlay feeding support frame is installed a counting switch that extends into the upper conveyor belt, and near the upper and lower conveyor belts at the upper end of the overlay feeding support frame, there is also a packaged goods anti-bounce device. During operation, according to the predetermined input packaging quantity, it can arbitrarily package from one item up to a hundred or even more items.