The invention relates to a graphene-reinforced carbon-coated sodium titanium manganese phosphate microsphere electrode material and a preparation method thereof, wherein the material can be used as apositive electrode active material of a sodium ion battery, the chemical formula is Na3MnTi (PO4) 3/C @ rGO, and the diameter of the microsphere is 0.2-5. Mu. and the carbon content is 5%-10%. The invention has the advantages of: As a sodium ion cathode material, As that conductivity of the cathode material of the polyanion sodium ion battery is poor, Disadvantages of rapid capacity decay, At thesame time, the multiplier performance of the material is improved, so that the material possesses high reversible capacity, good cycle stability and high multiplier performance while possessing largecapacity, and the preparation process is simple, the yield is high, the material is suitable for industrialized mass production, is conducive to market promotion, and has wide application prospects inthe field of sodium ion batteries.