Continuous wire feeding coaxial extrusion friction stir additive manufacturing device and method

The invention discloses a continuous wire feeding coaxial extrusion friction stir additive manufacturing device and method, the continuous wire feeding coaxial extrusion friction stir additive manufacturing device comprises a friction stir device and a shredding extrusion device, and the friction stir device comprises a clamping part, a stirring head and a stirring needle located on the lower portion of the stirring head; a filamentous raw material is continuously fed into a material storage cabin composed of a stirring head, an inner shaft sleeve and a sleeve through a wire feeding channel, the filamentous raw material is cut off and extruded into a solid body under the rapid reciprocating motion of the inner shaft sleeve in the axial direction, and the filamentous raw material is gradually thermally plasticized under the combined action of friction stirring of a shaft shoulder of the stirring head and a stirring needle; and after being stirred by the spiral groove and subjected to reciprocating forging and