The utility model discloses a condensed water discharge device of a seawater desalinization evaporator, comprising a tube plate and a heat exchange tube arranged on the tube plate, wherein the tail end of the heat exchange tube protrudes out of the tube plate. By adopting the condensed water discharge device of the seawater desalinization evaporator, as the tail end of the heat exchange tube protrudes out of the surface of the tube plate, condensed water discharged by the heat exchange tube at the upper part does not block the discharge of the condensed water of the heat exchange tube at the lower part; furthermore, the outflow resistance of the condensed water is obviously reduced, therefore, the heat exchange efficiency inside the tube is improved.