The invention discloses a coked naphtha and diesel oil and heavy aromatic mixed processing method which comprises the following steps: carrying out deep hydrofining on coked naphtha and diesel oil andheavy aromatics as raw materials, removing sulfur, nitrogen, alkadiene an colloid in the raw material, and meanwhile, saturating part of bicyclic aromatic hydrocarbons; cutting the hydrofined productin a fractionating system to obtain light hydrocarbon comprising dry gas and liquefied gas, high hydrocarbon gasoline and fraction at 205 DEG C, wherein the light hydrocarbon comprising dry gas and liquefied gas is removed through a stabilizing tower and the high hydrocarbon gasoline is output as a product; carrying out a hydrocracking reaction on the fraction at 205 DEG C and returning the cracked product to the fraction system to be mixed with a refined product to cut, wherein the catalyst noble metal for hydrocracking is a hydrocracking catalyst, a catalyst carrier is a mixture of aluminumoxide and an HY or USY type molecular sieve, the active component is Pt which accounts for 0.1-0.3wt.%, and the auxiliary metal is Ce or Le which accounts for 0.5-3wt%. High-knock rating gasoline canbe produced to the maximum extent by means of the method, and the service life of the catalyst is long.