The invention discloses a refinery gas combination processing technology. The process comprises the following steps: (a) mixing feedstock oil of wax oil and circulating oil with hydrogen in a hydrogen-dissolving device, and then enabling the product to enter hydrogenation catalyst bed layers in a hydrogenation reactor for carrying out a reaction under hydrogenation operating conditions, wherein agas-dissolving device is arranged between the every two adjacent catalyst bed layers; (b) after mixing of refinery gas and/or the hydrogen, entering the gas-dissolving device arranged between any adjacent catalyst bed layers; (c) mixing a hydrogenation reactant stream, obtained in the step (b), with the refinery gas and the hydrogen in the gas-dissolving devices, and then enabling the product to enter hydrogenation catalyst bed layers in a supplementary hydrogenation reactor for carrying out a reaction under liquid phase hydrogenation operating conditions; (d) separating hydrogenation reactioneffluent obtained in the step (c) to obtain a gas phase and a liquid phase, carrying out fractionation on the separated liquid phase to obtain naphtha, diesel oil and hydrogenated heavy fraction oil;mixing part or all of the diesel oil and/or hydrotreated heavy fraction, obtained in the step (c), with the hydrogen, enabling the mixture to enter hydrocracking catalyst bed layers in a hydrocracking reactor for carrying out a reaction, and carrying out fractionation on the separated liquid in a fractionating tower to obtain the naphtha, jet fuel, the diesel oil and tail oil. The method can realize the hydrotreatment of the refinery gas and the production of a high quality hydrocracked liquid product at the same time.