Marine Exhaust gas scrubber is mainly through cooling gas and lye contact in order to fully absorb sulfur substances carried in exhaust gas after burning heavy oil, and then discharge; The gas inlet is provided with seawater cooling spray device, the lower part of the tower is provided with a packing layer to increase the gas-liquid contact area, the upper part of the tower is provided with a mist eliminator to remove the liquid in the exhaust gas before discharge. The sulfur content in the flue gas after desulfurization is ≤0.1%