The invention discloses a nano particle doped REBCO film and a preparation method thereof, and belongs to the technical field of high-temperature superconducting material preparation. The film consists of an REBCO film and nano particles dispersed in the REBCO. The preparation method comprises the following steps of: preparing 1.0 to 2.0 mol/L of REBCO precursor solution, adding inorganic salt ofSn, Zr, Ta or Nb into the precursor solution and then coating the solution to a single crystal substrate, pre-sintering the substrate in wet oxygen of less than 400 DEG C, then sintering the obtainedprecursor amorphous film for 1 to 4 hours at the temperature of between 800 and 850 DEG C, introducing wet Ar/O2 mixed gas into the precursor amorphous film in front 3/4 time, introducing dry Ar/O2 mixed gas into the precursor amorphous film in later 1/4 time, switching the dry Ar/O2 mixed gas to pure oxygen when the temperature is reduced to 500 DEG C, preserving the heat for 2 to 4 hours, and cooling the film along with a furnace. The doped REBCO film has higher superconducting performance under a high-temperature high field and application prospect.