Preparation process of coal-oil slurry

The invention relates to the technical field of direct liquefaction, in particular to a preparation process for coal-oil slurry. The preparation process comprises the following steps: grinding and mixing large-particle-size pulverized coal particles which are not dried, hydrogenation solvent oil and a catalyst to obtain water-containing coal-oil slurry, and conducting dehydrating to obtain coal-oil slurry with a water content of less than or equal to 3%. According to the preparation process, equipment and cost are reduced, the coal-oil slurry is uniform in granularity and is uniformly mixed, and a finished product is good in quality. The invention also discloses a device. The device comprises an evaporation tank, wherein the evaporation tank comprises baffle plates which divide an inner tank cavity into a plurality of communicating branch grooves, and the temperature of the inner tank cavity is arranged according to the gradient of the branch grooves, so blast boiling in the heating dehydration process of the