The conventional oil shale refinery suffers from inefficiency in resource use and poor economic performance. This is because that detrital oil shale and retorting gas are not properly used. Hydrogenation of crude shale oil is not cost-efficient with outsourcing hydrogen. Proposed in this paper is an integrated oil shale refinery with reforming of the retorting gas. The retorting gas is used to produce hydrogen, which is then supplied for the hydrogenation. Crude shale oil is upgraded to higher valued products, such as naphtha, diesel, and liquefied petroleum gas. The detrital oil shale is combusted to provide heat for the regeneration of CaO. Economic analysis is conducted by comparing to the conventional refinery process. Results show that the return on investment of the proposed process is 18.89%, much higher than the previous 10.53% of the conventional refinery process.