The invention discloses a low-temperature mechanical property testing method of a superconducting conductor. In order to judge and analyze the problems of related performance degradation of a cable inan electromagnetic force operation environment due to influence of electromagnetic force and thermal stress, alternating current coupling loss in the cable operation process and the like, the superconducting conductor operation environment needs to be simulated to test the related performance of the superconducting conductor, and stress in the operation, cooling and heating processes is simulatedaccording to actual requirements and experiment requirements. The mechanical performance and the current-carrying performance of the superconducting conductor are compared and analyzed through the simulation result, the change of the related performance in the operation process of the superconducting conductor is preliminarily judged, the experiment time is short, the cost is low, the maintenanceis simple, frequent testing can be carried out, and the measured data accuracy is high.