NOVELTY - An ammonia gas-recovering system comprises a saturator, a thickener, a centrifuge, a phase separator, a mother liquor reservoir containing concentrated sulfuric acid, and a low-carbon alcohol storage tank. The saturator is provided with an exhaust gas inlet, acid inlet, acid reflux mouth, acid recovery port, and purge gas discharge outlet. An ammonia gas is fed into the saturator via exhaust gas inlet. The ammonia gas is mixed with the low-carbon alcohol using a sprinkler. The acid reflux mouth is connected with the mother liquor reservoir.    USE - The system is useful for recovering ammonia gas from ammonia-containing low-carbon alcohol.    ADVANTAGE - The system easily recovers ammonia gas from ammonia-containing low-carbon alcohol with improved recovery rate in an environmentally-friendly manner. The saturator is operated at 40-70 degrees C and pressure of 0.1-0.5 MPa. The concentration of sulfuric acid in the mother liquor storage tank is 1-2 wt.%.    DETAILED DESCRIPTION - An ammonia gas-recovering system comprises a saturator, a thickener, a centrifuge, a phase separator, a mother liquor reservoir containing concentrated sulfuric acid, and a low-carbon alcohol storage tank. The saturator is provided with an exhaust gas inlet, acid inlet, acid reflux mouth, acid recovery port, and purge gas discharge outlet. An ammonia gas is fed into the saturator via exhaust gas inlet. The ammonia gas is mixed with the low-carbon alcohol using a sprinkler. The acid reflux mouth is connected with the mother liquor reservoir. A crystal slurry outlet is present in communication with a bottom portion of the centrifuge. The acid recovery port is present in communication with a liquid inlet port. The purge gas discharge outlet is present in communication with the phase separator. An outlet of low-carbon alcohol storage tank is present in communication with the mother liquor reservoir. An INDEPENDENT CLAIM is included for method for recovering ammonia gas from ammonia-containing low-carbon alcohol.