Residual oil hydrogenation treatment system and treatment method thereof

The invention discloses a residual oil hydrogenation treatment system and a treatment method thereof and belongs to the field of petroleum processing. The system comprises a residual oil hydrogenationreaction device, a thermal high-pressure separator, a thermal low-pressure separator, a residual oil hydrogenation fractionation device, a heat exchange device, a hydrogenation refining reaction device, a cold high-pressure separator, a cold low-pressure separator, a hydrogenation refining fractionation device and a hydrogenation pipeline, wherein the inlet of the thermal high-pressure separatorcommunicates with the outlet of the residual oil hydrogenation reaction device; the inlet of the a thermal low-pressure separator communicates with the thermal high-pressure separator; a first inlet and a second inlet of the residual oil hydrogenation fractionation device respectively communicate with the exhaust hole and the liquid discharge hole of the thermal low-pressure separator; the shell pass inlet of the heat exch