The invention relates to a high-temperature-resistant high-elastic nickel-chromium alloy strip. The alloy strip comprises, by weight, 0.02%-0.10% of C, 0.003%-0.008% of B, 1.3%-1.7% of Al, 1.9%-2.3% of Ti, 19.0%-21.0% of Cr, 8.0%-9.0% of Mo, 9.0%-11.0% of Co and the balance Ni. The invention further provides a preparation method of the high-temperature-resistant high-elastic nickel-chromium alloy strip. The production procedures of the method include material proportioning, vacuum induction melting, vacuum self-consuming smelting, homogenization, cogging, hot forging, hot rolling, solid solution treatment, acid pickling, cold rolling, finished product annealing and packaging. The preparation process is simple, operation is convenient, the cost is low, the structure homogeneity of the strip can be improved effectively, the mechanical property and using temperature of the strip can be remarkably improved, the service life of the strip can be remarkably prolonged, the defects in the prior art are overcome, and the industrial application prospects are wide.