Abstract: Disclosed herein are an apparatus for joining second-generation ReBCO high temperature superconducting wires and a joining method using the same which are capable of fabricating sufficiently long superconducting wires of a persistent current mode having almost zero resistance at the joint of the wires compared to the conventional non-superconducting joint by press-joining the ReBCO high temperature superconductor layers placed to make a direct surface contact with each other through melting diffusion or solid-state diffusion of a tiny portion of a material of the superconductor layers without a medium such as solder or a filler.