An auto strapping packaging tool having a clamp fixing apparatus, comprising: a body assembly; a tension module which is partially coupled to the body assembly and provides 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 and rotated about a second shaft; a welding module, which includes a second motor and a third motor, configured to provide 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 which is axially rotatably coupled to the body assembly and switched to an open mode while a position thereof is fixed by being hooked on the first hooking element when a pulling operation of a user is applied thereto, wherein in the open mode, the clamp part is separated and moved away from the feed wheel part, wherein the welding module further includes: a friction providing unit which is disposed in the body assembly and linearly reciprocates due to second power generated by the second motor to provide the friction force to the plastic band to which the tensile force is applied by the tension module; and an opening and closing unit which has one end coupled to the friction providing unit, performs link movement due to third power generated by the third motor to provide vertical movement for the friction providing unit, and opens or closes the friction providing unit through an operation according to axial rotation, wherein the first motor, the second motor and the third motor are disposed in rear portions in the modules (200, 300). a body assembly; a tension module which is partially coupled to the body assembly and provides 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 and rotated about a second shaft; a welding module, which includes a second motor and a third motor, configured to provide 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 which is axially rotatably coupled to the body assembly and switched to an open mode while a position thereof is fixed by being hooked on the first hooking element when a pulling operation of a user is applied thereto, wherein in the open mode, the clamp part is separated and moved away from the feed wheel part, wherein the welding module further includes: a friction providing unit which is disposed in the body assembly and linearly reciprocates due to second power generated by the second motor to provide the friction force to the plastic band to which the tensile force is applied by the tension module; and an opening and closing unit which has one end coupled to the friction providing unit, performs link movement due to third power generated by the third motor to provide vertical movement for the friction providing unit, and opens or closes the friction providing unit through an operation according to axial rotation, wherein the first motor, the second motor and the third motor are disposed in rear portions in the modules (200, 300). a friction providing unit which is disposed in the body assembly and linearly reciprocates due to second power generated by the second motor to provide the friction force to the plastic band to which the tensile force is applied by the tension module; and an opening and closing unit which has one end coupled to the friction providing unit, performs link movement due to third power generated by the third motor to provide vertical movement for the friction providing unit, and opens or closes the friction providing unit through an operation according to axial rotation, wherein the first motor, the second motor and the third motor are disposed in rear portions in the modules (200, 300).