The invention relates to a leading-out head used for a steel conticaster. The invention is provided with a connecting piece used to connect with the steel melting material and a sealing pad used to seal a molding wall, the connecting piece and the sealing pad can be assembled at the outer edge of the mold quickly, conveniently and accurately and can be connected with a molding belt quickly. A clearance between the leading-out head and the four walls with openings of the mold is used as a fire resistant flat sealing pad (1) which is pressed by a steel plate (12); the steel plate (12) is arranged on the flat end face of a bottom part (8) of a closing part; the circumference of the pad is slightly higher than the steel plate; the upper part has a connecting piece (9) of a protruding body (13) filled in the mold; the surrounding of the leading-out head keeps a distance a with the inner wall of the mold and is connected with the bottom part detachably. |