Provided is an auto strapping packaging tool having a clamp fixing apparatus including a body assembly, a tension module partially coupled to the body assembly and providing a tensile force to a plastic band using a first motor, a feed wheel part rotated by the first motor about a first shaft, and a clamp part disposed around the feed wheel part to be rotated about a second shaft, a welding module including a second motor and a third motor and providing a friction force to the plastic band to which the tensile force is applied by the tension module, a hooking part provided with a first hooking element axially rotatably disposed in the body assembly and a second hooking element fixedly disposed in the body assembly, and a lever unit axially rotatably coupled to the body assembly.