Fabricated roof and construction method thereof

The invention discloses a fabricated roof and a construction method thereof, and solves the technical problems of low construction efficiency, and difficulty in control of on-site wet operation and waterproof operation quality existing in the construction of a steel structure building roof at present. The system comprises a main gutter installed on a steel structure main beam, a secondary gutter installed on a steel structure secondary beam, and an integrated heat preservation integrated plate in lap joint with the main gutter and the secondary gutter. And the end part of the secondary gutter is lapped on the side wall of the secondary gutter. The device is prefabricated in a factory, the industrialization degree is high, only sequential hoisting is needed on site, the construction efficiency is high, and the surrounding environment is prevented from being affected by on-site wet operation; industrial production is adopted for the integrated heat-preservation integrated board, proper heat-preservation materia