The invention provides a method for preparing a high-density iron-based compound superconducting tape. The method comprises the following steps: adding original powder of an iron-based compound to a metal sheet; drawing and rolling the original powder into a tape with certain size; and applying high temperature and pressure to the tape at the same time in vacuum or inert atmosphere so that the original powder of the iron-based compound generates the high-density iron-based compound superconducting tape through reaction. In the method, the defects of a superconducting core such as low density,poor electrical connectivity and the like are overcome, and the method is applicable to preparing the iron-based compound superconducting tape with high critical current density.