The invention discloses a gas phase-liquid phase hydrogenation combined method and device. Raw oil, hydrogen and circulating oil are mixed in a mixer, then a gas phase raw material-hydrogen mixture enters a gas phase reactor to undergo hydrogenation reaction, a hydrogen dissolved liquid raw material enters a liquid phase reactor to undergo reaction, a liquid phase reactor outlet material flow undergoes gas-liquid separation, part of the separated product serves as the circulating oil, and part of the separated product is mixed with a gas phase reactor outlet material flow to serve as a product. The process and the device provided by the invention overcome the mutual influence of the gas phase and liquid phase in the hydrogenation process, improve product quality, and reduce the device transformation during product upgrading.