The invention discloses a method for preparing high-cleanness fuel oil from intermediate-temperature and low-temperature coal tar, relating to the reprocessing technique of coal tar. The method comprises the following steps: stirring, mixing and extracting solvent and coal tar; standing; recovering the solvent through the evaporation of light liquid in the upper layer of the mixture to obtain theclean light fuel oil; and recovering the solvent through the evaporation of heavy liquid at the lower layer of the mixture to obtain the heavy fuel oil, wherein the solvent is recyclable after recovery. Having passed the pilot plant test and being operated for one year, the method of the invention is proven to be a technological method which has the advantages of simple process and low productionand operation costs and is capable of preparing high-cleanness fuel oil; the method of the invention is suitable for the process for pre-hydrotreating coal tar, and the high-cleanness fuel oil is prepared from intermediate-temperature and low-temperature coal tar in a solvent-extraction manner; the prepared fuel oil is a material of the process for the hydrogenation preparation of gasoline and diesel, and the prepared fuel oil is also available as component oil to be blended with residual oil to obtain 180CST marine fuel oil.