The present invention discloses a poor-quality raw material hydrocracking method. According to the method, a poor-quality raw material is firstly subjected to a first-stage hydrorefining reaction, and the reaction effluent is separated; and the liquid enters a second-stage refining stage to carry out a deep denitrogenation and aromatic hydrocarbon saturation reaction, a gas-liquid co-current flow process and a gas-liquid counter flow process are concurrently adopted in the second stage, the refining generated oil obtained in the second stage and hydrogen gas are mixed and then enter a third-stage reaction zone to carry out a hydrocracking reaction. With the method of the present invention, the nitrogen-containing impurities in the poor-quality raw material can be subjected to hydrotreating under the relatively mild condition so as to make the poor-quality raw material meet the hydrocracking feeding requirement, such that the hydrocracking raw material source is broadened; and the hydrorefining temperature is substantially reduced so as to increase the operation period of the device and process the poor-quality raw material, or increase the processing capacity of the device in the same operation period.