The invention provides high-
dispersity white
carbon black and a preparation method thereof. The preparation method comprises the following steps: (1) heating water, adding water glass, then adding ethyl
alcohol, and mixing the water, the water glass and the ethyl
alcohol to obtain a reaction base solution, wherein the temperature in the whole process does not change, the concentration of the waterglass is 0.01 to 1.00 mol / L, and the
mass percentage of the ethyl
alcohol is 0.1 to 5 weight percent; (2) simultaneously adding acid and water glass into the reaction base solution for mixing for reaction, thereby obtaining white
carbon black suspension, wherein the
reaction temperature is kept constant and is equal to that of the reaction base solution, and the concentration of the water glass is kept constant and is equal to that of the reaction base solution; (3) stopping adding the water glass into the white
carbon black suspension, and independently adding acid to adjust the pH of a
reaction system to 3.0 to 5.0, thereby obtaining acidified white carbon black suspension; (4) carrying out
solid-liquid separation on the acidified white carbon black suspension to obtain a
filter cake, thereby obtaining the white carbon black. The white carbon black provided by the invention is extremely high in dispersivity, and shows a good rubber reinforcing effect.