The invention relates to a transmission layer film of Zr doped with CeO2 and a preparation method thereof, belonging to a preparation technical field of superconducting material of high-temperature coating. The film of Ce1 minus xZrxO2 (x is no less than 0.1 and no more than 0.5) provided by the invention is obtained by the following method that: firstly, organic Ce salt and organic Zr salt are dissolved in solution of positive propionic acid and methanol or acetylacetone by molar ratio of cations of 1-x: x, wherein x is no less than 0.1 while no more than 0.5, so as to obtain precursor solution; then the precursor solution is deposited in a baseband of NiW alloy or a substrate of single crystal by adopting the method of sputtering or dip coating; under the condition of communication of protective gas, sintering is carried out for 15 to 120 minutes at temperature of 950 to 1,200 DEG C, thus obtaining the film of Ce1 minus xZrxO2. The thickness of the invention can reach 30 to 250nm; the film surface is compact and flat without microscopic cracks or holes; in addition, the invention has high texture, simple preparation process and low cost.