The invention relates to a sodium ion battery layered positive electrode material, a preparation method and an application thereof, wherein the sodium ion battery layered positive electrode material is NaNi<0.5-x-y>B<x>C<y>Mn<0.5-z>A<z>O<2>, A is selected from one of Sn, Ti, Nb, Sb and Bi, and z is greater than or equal to 0.02 and less than or equal to 0.08; wherein B is selected from one of Cu or Li, and x is greater than or equal to 0.05 and less than or equal to 0.15; wherein C is selected from one of Mg, Ca and Ba, and y is greater than or equal to 0.05 and less than or equal to 0.12. According to the positive electrode material prepared by the invention, the original Ni site is replaced by the metal, which has the same valence state or lower valence state and is not easy to oxidize,so that the structural stability of the layered positive electrode material with the replaced Ni site is better, and the prepared battery has excellent long-cycle performance and transmission dynamicperformance. The positive electrode material prepared by the invention has good rate capability and cycling stability. The preparation method of the cathode material is simple, environment-friendly, pollution-free and suitable for large-scale production.