The invention discloses an annular sheet-like hexagonal manganese tetroxide lithium battery negative electrode material and a preparation method thereof. The preparation method comprises the followingsteps: dissolving a manganese salt in water, and preparing a manganese salt solution; adding acetylacetone in the manganese salt solution, then adding a cetyltrimethylammonium bromide (CTAB) solution, and forming a pale yellow solution; adding hydrazine hydrate to the solution until a pale yellow flocculent precipitate is obtained, carrying out centrifugal separation of the precipitate, washing with deionized water for three times, washing with anhydrous ethanol for three times, and drying to obtain a pale yellow manganese precursor; and calcining the obtained manganese precursor with a temperature-controlled muffle furnace at high temperature, and naturally cooling to obtain the annular sheet-like hexagonal manganese tetroxide. The manganese tetroxide negative electrode material has goodcharge and discharge capacity and good cycling performance.