The invention relates to a multi-core high-temperature superconducting band material and a method for preparing the band material, wherein the band material comprises at least two types of single-core superconducting wires and an outermost layer of metallic basic body materials which are packed around the wires, wherein the first type of the single-core superconducting wire comprises a superconducting core with the superconducting performance and a first conducting basic body packed around the superconducting core, the second type of the single-core superconducting wire comprises the superconducting core with the superconducting performance and a second conducting basic body packed around the superconducting core, the strength of the first conducting basic body is smaller than that of thesecond conducting basic body, the single-core superconducting wires are parallel to each other along the length direction and are compactly arranged on the cross section in layers, wherein the first type of the single-core superconducting wire is located on the inner layer of the band material, the second type of the single-core superconducting wire is located on the external layer of the band material, the density distribution of the superconducting core in the multi-core high-temperature superconducting band material which is prepared by utilizing the method has higher uniformity, thereby the method can effectively improve the electric performance of the whole superconducting band material.