A ship flue gas scrubbing method comprising the steps as follows: a. leading in flue gas, in which flue gas discharged by an engine is led into a scrubber, and the leaded-in flue gas is caused to flow upwards in the scrubber; wherein the scrubber comprises a housing, a scrubbing layer with fillings which is fixed within the housing at an upper part of the housing, a liquid collecting pool with a seawater discharging outlet being provided within the housing at the lower part of the housing, a cooler for cooling high temperature flue gas, a flue gas leading pipe connected to a wall of the housing with a flue gas inlet (3.1) outside the housing and a flue gas leading-in port (3.2) inside the housing; and a clean gas outlet being provided at a top of the housing; wherein the cooler is a cooling flow equalization layer provided between the gas leading-in port (3.2) inside the housing and the scrubbing layer with fillings, and the cooling flow equalization layer is composed of high temperature resistant components fixed, or installed by means of fasteners, on an inner wall of the housing and the high temperature resistant components include high temperature resistant fillings and a filling supporting frame and the filling supporting frame is fixed on an inner wall of the housing directly or through fasteners; b. injecting scrubbing seawater, in which the scrubbing seawater is injected into the scrubber from a scrubbing seawater entrance located above the scrubbing layer with fillings of the scrubber, and the scrubbing seawater is caused to flow downwards in the scrubber; c. scrubbing, in which scrubbing in a counter-flow way is realized by flowing the scrubbing seawater, which is injected from above the scrubber, through the scrubbing layer with fillings to contact low temperature flue gas that goes upwards; d. cooling, in which high temperature flue gas is cooled by the cooler, and the scrubbing seawater flows downward through the cooler to reduce the temperature of the high temperature flue gas, then a cooled flue gas goes upwards to enter the scrubbing layer with fillings; e. discharging clean flue gas, in which, after being scrubbed, clean gas goes upwards and is discharged via the cleaned flue gas outlet; f. discharging the scrubbing seawater, in which the seawater, after being scrubbed, falls into the liquid collecting pool and is discharged from the seawater discharging outlet. a. leading in flue gas, in which flue gas discharged by an engine is led into a scrubber, and the leaded-in flue gas is caused to flow upwards in the scrubber; wherein the scrubber comprises a housing, a scrubbing layer with fillings which is fixed within the housing at an upper part of the housing, a liquid collecting pool with a seawater discharging outlet being provided within the housing at the lower part of the housing, a cooler for cooling high temperature flue gas, a flue gas leading pipe connected to a wall of the housing with a flue gas inlet (3.1) outside the housing and a flue gas leading-in port (3.2) inside the housing; and a clean gas outlet being provided at a top of the housing; wherein the cooler is a cooling flow equalization layer provided between the gas leading-in port (3.2) inside the housing and the scrubbing layer with fillings, and the cooling flow equalization layer is composed of high temperature resistant components fixed, or installed by means of fasteners, on an inner wall of the housing and the high temperature resistant components include high temperature resistant fillings and a filling supporting frame and the filling supporting frame is fixed on an inner wall of the housing directly or through fasteners; b. injecting scrubbing seawater, in which the scrubbing seawater is injected into the scrubber from a scrubbing seawater entrance located above the scrubbing layer with fillings of the scrubber, and the scrubbing seawater is caused to flow downwards in the scrubber; c. scrubbing, in which scrubbing in a counter-flow way is realized by flowing the scrubbing seawater, which is injected from above the scrubber, through the scrubbing layer with fillings to contact low temperature flue gas that goes upwards; d. cooling, in which high temperature flue gas is cooled by the cooler, and the scrubbing seawater flows downward through the cooler to reduce the temperature of the high temperature flue gas, then a cooled flue gas goes upwards to enter the scrubbing layer with fillings; e. discharging clean flue gas, in which, after being scrubbed, clean gas goes upwards and is discharged via the cleaned flue gas outlet; f. discharging the scrubbing seawater, in which the seawater, after being scrubbed, falls into the liquid collecting pool and is discharged from the seawater discharging outlet.