The invention discloses a gas-liquid countercurrent two-stage hydrocracking method, which comprises the following steps: (1) using a
fixed bed reactor, mixing feedstock oil with
hydrogen, then firstlyenabling the mixture to enter a hydrofining reactor for carrying out desulfurization,
denitrification and an
aromatic hydrocarbon saturation reaction, and then enabling
effluent to enter a flash tankso as to be subjected to gas-liquid separation; (2) enabling new
hydrogen to enter a hydrocracking reactor from the bottom of the hydrocracking reactor, and enabling
liquid phase effluent, obtained after separation of the flash tank, to enter the hydrocracking reactor from the top of the hydrocracking reactor so as to be subjected to a hydrocracking reaction, and enabling
gas phase, obtained after separation of the flash tank, to separately enter different
bed layer inlets of the hydrocracking reactor; (3) enabling
effluent of the hydrocracking reactor to enter a
separation system so as to besubjected to gas-liquid separation, recycling the separated gas as supplemental
hydrogen, enabling the
liquid phase product to enter a fractionating
tower so as to be separated, carrying out
fractionation in a the fractionating
tower to obtain
naphtha,
jet fuel, diesel oil and
tail oil. The method can effectively solve the problem of temperature matching of the refining and
cracking reactors, reduces the consumption of cold hydrogen at an entrance of the
cracking reactor, and increases the yield of the
naphtha.