Disclosed is a method of preparing an electrode material using a hydrothermal synthesis process, including (a) mixing an electrode material precursor and high-temperature, high-pressure water so as to react with each other, thus producing an electrode material-containing stream, (b) cooling the electrode material-containing stream through heat exchangers, (c) reducing the pressure of the cooled electrode material-containing stream using a pressure reducer, and (d) concentrating the electrode material-containing stream at the reduced pressure using a concentrator, thus producing a concentrated electrode material. According to this invention, synthesis conditions are maintained stable, continuous mass production is possible, and operation stability of the synthesis process can be ensured. Particularly, the concentrator is disposed downstream of the pressure reducer and thus a low-pressure concentrator can be applied, thereby lowering the preparation cost, and increasing heat recovery efficiency by using a plurality of heat exchangers to thus attain energy saving effects.
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