The present invention relates to an LNG dual-fuel ship VOC recycling process based on intermediate medium heat exchange. The process uses a three-stage condensation circulation system, and the intermediate media use but are not limited to ethane, propane, ethylene glycol, and water. The LNG sequentially cools ethylene, propane, ethylene glycol, and water. The VOC firstly enters a third condenser to be subjected to primary condensation by cooled ethylene glycol and water, and then enters a third separator to be subjected to primary gas-liquid separation; residual gas enters a second condenser to be subjected to secondary condensation by cooled propane, and then enters a second separator to be subjected to secondary gas-liquid separation; and residual gas enters a first condenser to be subjected to tertiary condensation by cooled ethane and then enters a first separator to be subjected to tertiary gas-liquid separation, and discharged gas is gas meeting an emission standard. According to the present invention, condensation recycling of VOC and cold energy utilization of LNG can be achieved, the emission standard can be met, energy loss is reduced, and the problem of waste of cooling capacity produced in an LNG gasification process in a conventional dual-power ship is also solved.