Abstract: Niobium is an important barrier layer material for superconducting wires. Niobium plates are welded by rolls and loaded with superconducting core materials such as Nb3Sn and NbTi, and then superconducting wires are obtained through extrusion, cluster drawing and other processes. Niobium plate is deformed and annealed in multiple fires during processing, and finally exists in the form of a superconducting wire barrier layer. Therefore, the niobium plate for superconducting wires has high requirements on grain size, mechanical properties and uniformity.In this paper, the rolling process and heat treatment system of niobium plate were designed and thoroughly studied in a controlled test. By comparing the differences in grain size and mechanical properties of the finished plates, the results were analyzed and the optimal solution was obtained. Niobium plates for superconducting use were produced at the temperatures of 1300℃, 1050℃, 960℃ and 860℃ for forging, hot rolling, intermediate rolling and finished rolling, respectively. The Nb plates produced at these temperatures have a grain size of ≥5.0（ preferably 6.0～7.0）, a recrystallization rate of ≥95%, and a Rp0.2 of ≥72MPa. The recrystallization rate and yield strength pass rate are high, the grain size distribution is uniform and the rating is consistent. On the basis of stable production process and product quality, the rolling process of niobium plate summarized in this paper is of great significance for improving product quality and accumulating superconducting niobium processing experience.