The full-automatic side-sealing shrink packaging machine is a non-standard customized product. 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, and automatically seals, cuts and shrinks the products. The detection switch controls the motor to automatically wind up the waste film, thus realizing the feature of unmanned automatic film wrapping. This machine has high working efficiency, with a speed of 1-20 pieces per minute for products of different sizes. It is also applicable to industries such as printing, color boxes, medicine, daily chemicals, auto parts and food.