Roof rainwater collecting device for sponge city

The utility model relates to the technical field of rainwater collecting devices. The roof rainwater collecting device for the sponge city comprises a rainwater collecting pipe, the system comprises awater-collecting roof, a water-collecting device and a water-collecting pipe, a plurality of groups of water collecting devices are rotationally connected to the interior of each inclined roof surface of the water collecting roof; the water collecting device comprises a water collecting barrel, a water collecting groove opening and a sealing plate; the water collecting barrel is rotationally connected with two sides of the water collecting roof through rotating shafts welded at two ends; a water collecting groove opening is formed in the outer wall of the water collecting barrel; water guideports are formed in two ends of the outer wall of the water collecting barrel; the water collecting pipe is arranged right below the water guide openings formed in the two sides of the water collecting device; the beneficial e