The invention discloses an inter-floor unit curtain wall structure which comprises a unit curtain wall component, upper channel steel, lower channel steel and a unit curtain wall plate component, wherein the unit curtain wall component comprises a upper opening adaption cross beam of a unit curtain wall, an upper cross beam of the unit curtain wall, a lower opening adaption cross beam of the unit curtain wall and a lower cross beam of the unit curtain wall; the upper channel steel, the upper opening adaption cross beam of the unit curtain wall and the upper cross beam of the unit curtain wall are connected with one another in sequence; the lower channel steel, the lower opening adaption cross beam of the unit curtain wall and the lower cross beam of the unit curtain wall are connected with one another in sequence; and the unit curtain wall plate component is installed between the upper cross beam and the lower cross beam of the unit curtain wall. The inter-floor unit curtain wall structure has the advantages that the construction flow of a common curtain wall is changed, and decoration panels of a cornice can be installed at first; and moreover, as no inter-floor curtain wall is used for separation in the stage, auxiliary equipment for scaffolds at the cornice can be implemented easily, so that cross operations can be implemented on a working face fully unfolded in construction, and parallel construction can be performed without the limitation of a construction order, thereby greatly improving the construction process.