The invention discloses coal water slurry prepared by mixing gasified coal with petrochemical wastes. The coal water slurry is prepared from the following components: coal, the petrochemical wastes, additives and water, wherein the mass of the petrochemical wastes accounts for 0-6% of the total mass of the coal water slurry but not zero, and the adding amount of the additives accounts for 0-0.15% of the total mass of the dry coal but not zero. The invention also discloses a slurrying technology of the coal water slurry. The coal water slurry provided by the invention is good in fluidity and stability.