A gasification processing system for LNG FPSO according to an embodiment of the present invention includes: a gas supply line connected from a liquefaction process flash tank to an inlet; An upstream scrubber provided on the gas supply line for accumulating liquid gas discharged from the liquefaction process flash tank or separating the gas into a gas and a liquid; A compressor provided on the gas supply line downstream of the upstream scrubber to pressurize the vaporized gas discharged from the scrubber; And a downstream scrubber provided downstream of the compressor on the gas supply line, the downstream scrubber separating the gas pressurized by the compressor into a gas and a liquid, the inlet being located upstream of the downstream scrubber and downstream of the downstream scrubber And a plurality of vaporized gases discharged from the compressor may be stored or may be supplied with vaporized gas discharged from the downstream scrubber. The vaporized gas processing system for LNG FPSO according to the present invention can reduce the excessive operation of the flare system for treating low temperature low pressure flash gas and BOG gas generated in the LNG FPSO process.
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