The invention belongs to the technical field of construction engineering, and particularly discloses a fabricated inverted ceiling keel installation method. The fabricated inverted ceiling keel installation method comprises the following steps that (1) BIM modeling is adopted, and three-dimensional data of installation of special-shaped metal inverted ceiling keels is extracted by modeling; (2) the BIM technology is adopted to perform fabricated installation simulation; (3) a unit module is subjected to hoisting construction, and electric rolling wheels are adopted to realize overall lifting of the unit module through three pulley blocks; (4) when the unit module is lifted to the range of a required control elevation error within 20cm, combined with a total station, three-coordinate three-dimensional space accurate positioning is performed; and (5) sub-keel welding installation between two unit modules is performed to complete the overall installation of the inverted ceiling keels. According to the fabricated inverted ceiling keel installation method, the problems that the construction quality of the inverted ceiling keels is affected and the construction efficiency is low due to deviation and repeated rework due to the fact that accurate data of the size and positioning of the keels cannot be obtained in the construction process of the a large-span special-shaped steel structure inverted ceiling are effectively solved.