The full-automatic side-sealing shrink packaging machine is a packaging machine developed and produced for large items such as wooden boards and ceramic tiles, which automatically seals, cuts and shrinks the film. The whole machine is equipped with a PLC program system, adopts photoelectric sensors to automatically detect products, automatically adjusts the feeding length according to the products, automatically seals, cuts and shrinks the products, and the detection switch controls the motor to automatically wind up the waste film. Thus, it realizes the feature of unmanned automatic film wrapping. This machine has high working efficiency, and can handle 35-60 pieces per minute for products of different sizes. This sealing, cutting and shrinking packaging machine is also applicable to industries such as printing, color boxes, medicine, daily chemicals, auto parts and food.