Hydrocracking method for producing middle distillates to maximum extent

The invention provides a hydrocracking method for producing middle distillates to the maximum extent. The method comprises the following steps of: simultaneously leading fresh raw oil to a hydrorefining reactor and a hydrocracking reactor in a mode of parallel flow; filling a hydrorefining catalyst and an amorphous hydrocracking catalyst in the hydrorefining reactor in sequence; filling a molecular sieve hydrocracking catalyst in the hydrocracking reactor; separating reactor effluent of the hydrorefining reactor to obtain light fraction and tail oil fraction; and sending all or partial tail oil fraction to the hydrocracking reactor, and simultaneously sending reactor effluent of the hydrocracking reactor and partial raw oil to the hydrorefining reactor. The hydrocracking method for producing middle distillates to the maximum extent can process heavy distillates and produce middle distillates to maximum extent. Because partial raw oil is sent to the hydrocracking reactor, over high cracking activity of the hydrocracking catalyst is avoided under the non-ammonia environment of the hydrocracking reactor system, and the secondary cracking phenomenon of more middle distillates is also avoided, so that the yield of the middle distillates is effectively improved.