The invention discloses an immersion nozzle for casting a central point of an ultrathin special-shaped blank, and belongs to the technical field of continuous casting of special-shaped blanks. The immersion nozzle comprises an immersion nozzle body, wherein the immersion nozzle body comprises a vertical section and a horizontal section, the vertical section and the central position of the horizontal section are integrally connected, the vertical section comprises a bowl part and an equal-diameter section, the bowl part is positioned at the upper end of the equal-diameter section, the inner cross section of the equal-diameter section is oval, and the long axis of the oval cross section is parallel to the central line of the horizontal section; the inner diameters of the horizontal section are equal and are symmetrical about the symmetrical surface of the vertical section, the shape of the inner vertical section is elliptic, the elliptic section is parallel to the central line of the vertical section, and through holes are arranged at the two ends of the horizontal section; and at least two downward inclined water holes are symmetrically arranged at the bottom end of the horizontal section. The structure of the immersion nozzle can be optimized, the temperature field and the flow field in the mold are stable, the flowing uniformity of molten steel is improved, the defects causedby continuous casting are reduced, the quality of ultra-thin special-shaped blank continuous casting is improved, and the immersion nozzle has the advantages of simple structure, reasonable design andeasiness in manufacturing.