Preparation method of coal water slurry

The invention discloses a preparation method of coal water slurry. The preparation method comprises following steps: (1) carrying out a sealing treatment on coal powder by using a hydrophobic material; (2) dissolving soluble salts into water to prepare a liquid carrier, (or taking seawater or concentrated seawater as a liquid carrier), wherein the ratio of liquid carrier to coal powder processed in the step (1) is not less than 0.9; and (3) evenly mixing the coal powder processed in the step (1) with the liquid carrier to obtain the coal water slurry. The mixing ratio of the coal powder to theliquid carrier needs to meet the flowing requirement of the water coal slurry. The method is suitable for various types of coals. The prepared water coal slurry will not precipitate during the delivering process in a pipeline and is not influenced by a low temperature, the pipeline obstruction problem is solved, furthermore, after coal water slurry reaches the destination, coal powder can be easily separated from the liq