Steel bar strapping machine and machine head body and machine head of steel bar strapping machine

The invention relates to a tool adopted in building construction, in particular to a steel bar strapping machine, and provides a steel bar strapping machine and a machine head body and machine head ofthe steel bar strapping machine. An outer shell connecting structure is arranged on the machine head body, and the machine head body is fixedly assembled on an outer shell of the steel bar strappingmachine through the outer shell connecting structure. The machine head body comprises front end parts and a rear end part. The front end parts are used for fixedly assembling wire guide blocks of thesteel bar strapping machine, and the front end parts are used for forming a wire guide channel together with wire guide grooves in the wire guide blocks so as to bend a strapping wire fed by a wire feeding mechanism into a circle. The outer shell connecting structure is arranged on the rear end part. The front end parts are detachably connected with the rear end part through detachable structuresand used for being replaced