Machining device and machining method for reducer pipe for screw anchor

The invention provides a spiral anchor reducer pipe machining device which comprises a workbench, a heating station and a deformation station are arranged on the workbench, a reciprocating positioning assembly is arranged on a machine base between the heating station and the deformation station, the positioning assembly comprises a vertically-lifting positioning base, a heating furnace is arranged above the heating station, and the heating station and the deformation station are arranged on the machine base. A machine base is arranged at the position of the deformation station, a vertically-lifting deformation mold is arranged on the machine base, the deformation mold is located above the positioning base, a discharging assembly is fixed to the portion, between the deformation mold and the positioning base, of the machine base and comprises two discharging sliding rods inclining downwards, and a discharging sliding groove is formed between the two discharging sliding rods. The distance between the discharging