The invention discloses a six-dimensional-interpolation-based method for obtaining electromagnetic scattering data of a near-space target. The method comprises: according to interconnectedness among all influence factors of target electromagnetic scattering data, all influence factors are classified into a plurality of groups; on the basis of influence degrees on the target electromagnetic scattering data by all influence factor groups, the plurality of groups are ranked in an ascending order; and for each to-be-interpolated group, groups except the to-be-interpolated group form an overall basic cell, interpolation is carried out on each influence factor group after ascending-order ranking, and target electromagnetic scattering data are obtained. According to the method disclosed by the invention, all influence factors are classified into a plurality of groups and interpolation processing is carried out on each to-be-interpolated data group, so that dimensionality reduction can be carried out on multi-dimensional data affecting the target electromagnetic scattering data; and thus under the circumstance that the existing modeling simulation calculation condition is not sufficient, electromagnetic scattering data of a near-space target in any state can be obtained in an approximate manner.