The invention discloses a connection method for an ultrahigh-rise core tube beam and a vertical structure. The connection method comprises the following steps: firstly, constructing a core tube shearwall structure by adopting a climbing form system; respectively setting the left and right end surfaces of embedded threaded sleeves as internal connection ends and external exposure ends; enabling the internal connection ends of the embedded threaded sleeves to all penetrate through embedded steel plates and be connected with embedded part anchoring steel bars; and after the wall is formed by pouring and reaches specified strength, constructing beam steel bars; installing the beam steel bars. According to the connection method, by cooperative use of the embedded part anchoring steel bars, theembedded steel plates and the embedded threaded sleeves, positions of the beam steel bars in a concrete pouring process can be kept unchanged, convenience is provided for connection of the beam steelbars in the later stage, and accurate positions of the beam steel bars are guaranteed; furthermore, the construction quality can be well guaranteed; and to construct a horizontal beam structure of acore tube of an ultrahigh-rise building, polystyrene boards are directly removed, and no chiseling for a concrete structure is needed, so that the construction intensity is reduced, and straight and smooth lines at concrete joints of the horizontal beam structure and the vertical structure are guaranteed.