The invention discloses a condensed water discharging device of a seawater desalting evaporator. The device comprises a tube plate and a heat exchange tube mounted on the tube plate, wherein the tail end of the heat exchange tube is protruded out of the tube plate. By adopting the condensed water discharging device of the seawater desalting evaporator of the invention, because the tail end of theheat exchange tube is protruded out of the tube plate surface, the condensed water discharged by the upper heat exchange tube does not block the discharge of the condensed water of the lower heat exchange tube; and moreover, the outflow resistance of the condensed water is obviously reduced, so the heat exchange efficiency in the tube is improved.