This invention discloses a poor quality catalytic cracking diesel hydrocracking method. After mixing poor quality catalytic cracking diesel and heavy hydrocracking material, hydrocracking is conducted at first, then its intermediate fraction is conducted the second hydrocraking. High aromatic hydrocarbon heavy naphtha and low BMCI value end oil. The catalyst activity will play sufficiently because some intermediate fraction oil has removed foreign matters, such as sulphur, nitrogen and so on, so it can be operated under higher space speed and lower temperature, and even operated under lower hydrogen partial pressure to take on a new look of economical. Further more; lower hydrogen partial pressure will be helpfulin intermediate fraction oil changing into High aromatic hydrocarbon heavy naphtha and lower temperature will reduce further cracking of heavy naphtha, so it will improve the yeild of heavy naphtha greatly.