To study the 25Mg(p,γ)26Al reaction at the Jin-ping Underground Nuclear Astrophysics laboratory, a large-area 25Mg target with a uniform thickness is needed. A rotating unit is used to ensure the uniformity of the target thickness during evaporation. After many attempts, 19 targets with diameters of 40 mm and a non-uniformity of 8.4％ were prepared simultaneously. The rate of material utilization was approximately 4.7 times higher than that obtained using a conventional evaporation method.