The invention discloses a ceramic grinding ball for a cement ball mill, and a preparation method thereof. The ceramic grinding ball for the cement ball mill comprises the following raw materials in weight percentage: 92-95% of alumina, 0.5%-2% of ferric oxide, 0.8-3% of kaolin, 0.2-2% of silicon carbide, 1.5-2% of titanium dioxide, 0.8-1% of titanium carbide, and 0.3-2% of molybdenum disulfide. According to the technical scheme of the invention, the grinding ball is prepared through the compression moulding and high-temperature sintering process. The preparation method comprises the steps of burdening, ball-milling, spray granulation, ageing in a stock bin, compression processing, high-temperature sintering, powder removing, polishing, finished product drying, and the like. The ceramic grinding ball for the cement ball mill has the advantages of high hardness, high temperature resistance, corrosion resistance, low operation energy consumption, low material consumption, good bonding force, strong impact resistance, shock resistance and detonation resistance. The produced cement is uniform in fineness, reasonable in particle morphology and high in later strength.