Abstract: A system for recovering an LPG fraction according to the present invention includes: a compressor increasing the pressure of excess gas such as associated gas; a deethanizer column dissolving, in a sponge oil, propane and butane contained in the excess gas and separating a gas having a carbon number of two or less from the excess gas; a sponge oil transfer pipe discharging the sponge oil from the deethanizer column; a debutanizer column separating propane and butane from the sponge oil; an LPG fraction discharge pipe discharging the fraction containing propane and butane from the debutanizer column; and a sponge oil return pipe returning the sponge oil from the debutanizer column to the deethanizer column.