Method for increasing yield of high-added-value products from ethylene cracking tar

The invention discloses a method for increasing yield of high-added-value products from ethylene cracking tar, which adopts a route of firstly fractionating to separate out light components and then hydrogenating heavy components, on one hand, part of naphthalene, methylnaphthalene and the like below 250 DEG C can be prevented from being hydrogenated to generate tetrahydronaphthalene and the like in a hydrocracking process; therefore, the yield of a target product is influenced; on the other hand, components with the temperature smaller than 250 DEG C account for about 30%-50%, the components are separated out in advance, and hydrogen consumption in follow-up hydrocracking can also be reduced. After the heavy fraction is subjected to hydrocracking, a part of polycyclic aromatic hydrocarbon in the heavy fraction can be cracked to generate a part of monocyclic aromatic hydrocarbon which can be used for producing aromatic solvent oil, so that the light fraction in the hydrocracking product is separated out and m