The invention discloses a prefabricated frame structure and a cascaded prefabrication construction method thereof. The prefabricated frame structure comprises stand columns (1), main beams (2) connected with the stand columns (1), secondary beams (3) connected with the main beams (2), and floors (5). Prefabricated members are adopted as the main beams (2) and the secondary beams (3) and are provided with reserved exposed steel bars. The floors (5) are laminated slabs, prefabricated slabs (51) are adopted for the lower portions of the floors (5), and concrete is cast on the tops of the prefabricated slabs (51), the main beams (2) and the secondary beams (3) on site so as to connect the prefabricated slabs (51), the main beams (2) and the secondary beams (3) together. By means of the prefabricated frame structure and the cascaded prefabrication construction method thereof, the on-site construction workload can be reduced more effectively, on-site slab nailing can be greatly reduced, and pollution and waste can be reduced; besides, manpower resources are greatly saved; the construction efficiency is effectively improved, and thus the construction period is shortened.
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