An engine exhaust gas purification device (1; 1A) for reducing or eliminating air pollution substances contained in exhaust gases discharged from a marine main engine equipped with an exhaust gas turbocharger, comprising: an exhaust gas cleaning unit that cleans a portion of exhaust gas, the portion of the exhaust gas being branched from an exhaust line located at the upstream side of a turbine unit in the exhaust gas turbocharger and introduced as a recirculation exhaust gas; and a recirculation exhaust gas turbocharger including a recirculation turbine unit which is disposed at the upstream side of the exhaust gas cleaning unit, and a recirculation compressor unit coaxial with the recirculation turbine unit, wherein the recirculation turbine unit is driven by utilizing the recirculation exhaust gas, wherein the exhaust gas cleaning unit cleans the recirculation exhaust gas which has passed through the recirculation turbine unit, the recirculation exhaust gas turbocharger takes the recirculation exhaust gas which has passed the exhaust gas cleaning unit into the recirculation compressor unit, and the recirculation compressor unit pressurizes the recirculation exhaust gas which has passed the exhaust gas cleaning unit, and the recirculation exhaust gas from the marine main engine is pressurized by the recirculation compressor unit and is (a) introduced to the upstream side of a compressor unit of the exhaust gas turbocharger, and supplied together with fresh air to the compressor unit of the exhaust gas turbocharger, or (b) introduced to a point between the compressor unit of the exhaust gas turbocharger and an air cooler cooling supplied air compressed by the compressor unit of the exhaust gas turbocharger, and merged with fresh air which has been pressurized by the compressor unit of the exhaust gas turbocharger, and wherein the recirculation exhaust gas pressurized by the recirculation compressor unit is supplied to the marine main engine after being merged with the fresh air. an exhaust gas cleaning unit that cleans a portion of exhaust gas, the portion of the exhaust gas being branched from an exhaust line located at the upstream side of a turbine unit in the exhaust gas turbocharger and introduced as a recirculation exhaust gas; and a recirculation exhaust gas turbocharger including a recirculation turbine unit which is disposed at the upstream side of the exhaust gas cleaning unit, and a recirculation compressor unit coaxial with the recirculation turbine unit, a recirculation turbine unit which is disposed at the upstream side of the exhaust gas cleaning unit, and a recirculation compressor unit coaxial with the recirculation turbine unit, wherein the recirculation turbine unit is driven by utilizing the recirculation exhaust gas, wherein the exhaust gas cleaning unit cleans the recirculation exhaust gas which has passed through the recirculation turbine unit, the recirculation exhaust gas turbocharger takes the recirculation exhaust gas which has passed the exhaust gas cleaning unit into the recirculation compressor unit, and the recirculation compressor unit pressurizes the recirculation exhaust gas which has passed the exhaust gas cleaning unit, and the recirculation exhaust gas from the marine main engine is pressurized by the recirculation compressor unit and is (a) introduced to the upstream side of a compressor unit of the exhaust gas turbocharger, and supplied together with fresh air to the compressor unit of the exhaust gas turbocharger, or (b) introduced to a point between the compressor unit of the exhaust gas turbocharger and an air cooler cooling supplied air compressed by the compressor unit of the exhaust gas turbocharger, and merged with fresh air which has been pressurized by the compressor unit of the exhaust gas turbocharger, and (a) introduced to the upstream side of a compressor unit of the exhaust gas turbocharger, and supplied together with fresh air to the compressor unit of the exhaust gas turbocharger, or (b) introduced to a point between the compressor unit of the exhaust gas turbocharger and an air cooler cooling supplied air compressed by the compressor unit of the exhaust gas turbocharger, and merged with fresh air which has been pressurized by the compressor unit of the exhaust gas turbocharger, and wherein the recirculation exhaust gas pressurized by the recirculation compressor unit is supplied to the marine main engine after being merged with the fresh air.