The invention discloses a high-stability superconductor electromagnetic wire pay-off device which comprises a frame, a rotating ring, a shaft rod, four sets of adjusting plates and a rotating
handle, and the surface of the shaft rod is provided with the four sets of adjusting plates through two sets of adjusting structures. The adjusting structure comprises two sets of
lantern rings arranged on the surface of the shaft rod in a sleeving mode, four sets of first hinge pieces arranged on the surfaces of the outer walls of the
lantern rings, a third rotating shaft penetrating through the other end of the second connecting rod and second hinge pieces arranged at the two ends of the third rotating shaft. By arranging an adjusting plate, an adjusting structure and the like, the problems that the
diameter of a rotating roller cannot be changed, when an electromagnetic wire with the large
diameter is wound, the bending amplitude of the electromagnetic wire is large when the electromagnetic wire is wound on the rotating roller, plastic deformation of a
metal wire in the electromagnetic wire is likely to happen, and the electromagnetic wire is damaged are effectively solved. And the problem that the released electromagnetic wire cannot be naturally recovered to a linear state, and additional straightening
processing operation needs to be carried out is solved, and the convenience of the device is improved.