In this paper, the simulation analysis of a large-scale magnetic shielding room is carried out by using the finite element analysis method, and the modeling and performance simulation calculation of a large-scale magnetic shielding room for ground calibration of a high-precision vector magnetometer are completed, and the simulation calculation and measured results of the magnetic shielding room are com-* 国家重点研发计划项目资助(2020YFE0202100)