To provide an organic solvent-containing gas treating system having an apparatus capable of stably removing acid component and moisture out of a large amount of collected organic solvents and capable of effectively utilizing drainage separated and discharged from the apparatus without discharging it to the environment such as rivers.

The organic solvent-containing gas treating system includes: an organic solvent collecting system that introduces treated gas into an organic solvent collecting/treating apparatus 10 having an absorption tank 13 filled with absorbent materials 14, after performing absorption treatment on the organic solvents and discharging the treated gas where the organic solvent concentration is decreased to complete the absorption treatment, introduces steam into the absorption tank of the organic solvent collecting/separating apparatus and desorbs the organic solvent from the absorbent materials, and introduces the steam containing the organic solvent generated into a solvent separating apparatus 20 that condenses and separates the steam containing the organic solvent; and an acid component removing solvent-refining apparatus 23 that introduces the collected organic solvent separated by the organic solvent collecting/treating apparatus into a solvent refining apparatus 40 having an absorption tank filled with an acid component removing agent, and discharges the treated organic solvent where the concentration of the acid component in the organic solvent is decreased.

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