Building roof structure

A building roof structure comprises a base frame and a top beam, the base frame is provided with a supporting frame, roof plates are installed between the base frame and the top beam, the roof plates are provided with a plurality of drainage grooves, the top beam is provided with movable grooves, and the base frame is hinged to the lower sides of the two roof plates. The high sides of the two roof plates extend into the movable grooves in the two sides correspondingly, a supporting mechanism is arranged between the base frame and the roof plates and comprises two mounting frames, two electromagnetic telescopic rods and an intermittent power supply assembly, the two mounting frames and the base frame are mounted and fixed, and sliding rails are arranged on the front sides and the rear sides of the roof plates correspondingly. The telescopic ends of the two electromagnetic telescopic rods are in sliding connection with the sliding rails; the supporting mechanism stretches and retracts up and down in a reciproca