The utility model discloses a water supply and sewerage system for production of carbonyl thing, this system give water drainage branch pipe way, exhaust fan and gas collection cabinet including what connect gradually, be many for the water drainage branch pipe way, and one end is connected with the plumbing main line, and the other end passes through bye -pass collection pipe way to be connected with the exhaust fan, still is equipped with the water seal well on the road for water drainage branch pipe. Use this system can reduce the hazardous gas among the carbonyl thing production water supply and sewerage system, guarantee operation safety.