A draining and sealing device for mist eleminators, said mist eliminator being of the forward flow or reverse flow types, or of parallel plates installed as a polygonal arrangement, being formed of a fiber filter body housed between two concentric or parallel screens, which hangs in an opening of a tubesheet, having an open upper end and a lower end closed with a closure, on which opening the draining and sealing device or said reverse flow mist eliminator is mounted, being formed of the tubular filter body that "stands" in the tubesheet opening and is provided with a closed upper end and a lower open end, wherein the draining and sealing device is mounted on the tubesheet opening, said draining and sealing device being characterized in that it comprises - a tubular body, formed by: an upper portion comprising a cover, having a closed upper end and radial drainage openings; - an intermediate portion for attachment to the lower closure opening of the filter body or attachment to the tubesheet opening; said intermediate portion comprising a thread; and a lower tubular portion having a lower side or lower end of the side face provided with drainage holes; said draining and sealing device also being formed of - a body of drainage and sealing fibers housed in the lower tubular portion that provides drainage of the collected liquid and sealing against the countercurrent circulation of mist-containing gas. said mist eliminator being of the forward flow or reverse flow types, or of parallel plates installed as a polygonal arrangement, being formed of a fiber filter body housed between two concentric or parallel screens, which hangs in an opening of a tubesheet, having an open upper end and a lower end closed with a closure, on which opening the draining and sealing device or said reverse flow mist eliminator is mounted, being formed of the tubular filter body that "stands" in the tubesheet opening and is provided with a closed upper end and a lower open end, wherein the draining and sealing device is mounted on the tubesheet opening, said draining and sealing device being characterized in that it comprises - a tubular body, formed by: an upper portion comprising a cover, having a closed upper end and radial drainage openings; - an intermediate portion for attachment to the lower closure opening of the filter body or attachment to the tubesheet opening; said intermediate portion comprising a thread; and - a tubular body, formed by: an upper portion comprising a cover, having a closed upper end and radial drainage openings; - an intermediate portion for attachment to the lower closure opening of the filter body or attachment to the tubesheet opening; said intermediate portion comprising a thread; and a lower tubular portion having a lower side or lower end of the side face provided with drainage holes; said draining and sealing device also being formed of - a body of drainage and sealing fibers housed in the lower tubular portion that provides drainage of the collected liquid and sealing against the countercurrent circulation of mist-containing gas. - a body of drainage and sealing fibers housed in the lower tubular portion that provides drainage of the collected liquid and sealing against the countercurrent circulation of mist-containing gas.