Superconducting wire critical current testing device and testing method

The invention belongs to the technical field of superconducting wire testing, and discloses a superconducting wire critical current testing device which comprises a superconducting magnet providing a background magnetic field, a superconducting wire sample testing thermostat is connected in the superconducting magnet providing the background magnetic field, and a sample rod is arranged at the center of the top of the superconducting wire sample testing thermostat in a penetrating mode. And the sample rod penetrates through the superconducting wire sample testing thermostat and is arranged in the center of the interior of the superconducting magnet for providing a background magnetic field. The superconducting wire critical current testing device provided by the invention is more reasonable in performance testing structure of a low-temperature superconducting wire under the 4.2 K condition, enhanced in reliability and more convenient to use. According to the superconducting wire critical current testing method