The invention discloses a dual-turbine marine diesel engine EGR system. The dual-turbine marine diesel engine EGR system comprises a circulation pipe, a discharge pipe is fixedly connected to the circulation pipe, a baffle is rotatably connected to the circulation pipe, a motor is fixedly connected to the circulation pipe, the output end of the motor is fixedly connected with a rotating shaft, thebottom of the rotating shaft penetrates the circulation pipe and is rotatably connected with the inner side wall of the circulation pipe, the rotating shaft is fixedly sleeved with a winding cylinder, a movable block is movably connected in the circulation pipe, the inner side wall of the circulation pipe is provided with a movable groove corresponding to the movable block. The motor drives the rotating shaft to rotate to drive the winding cylinder to rotate, through cooperation of a connection rope and a connection ring, the movable block is driven to move, and therefore a supporting rod drives the baffle to rotate; the amount and the flow direction of tail gas entering the discharge pipe and an internal combustion machine are adjusted through the baffle, and through an active carbon plate, the phenomenon that particulate in the tail gas enters the internal combustion machine can be avoided.