Roof rainwater collecting, purifying and utilizing system

The utility model discloses a roof rainwater collection, purification and utilization system, which belongs to the technical field of rainwater resource collection and utilization and comprises a water seepage layer, a plurality of water collection tanks, a purification tank and a plurality of water storage tanks. The purification tank is communicated with the water seepage layer through a main pipeline, the water collecting tanks are connected with the purification tank through branch pipelines, the water storage tanks are connected with the purification tank through branch pipelines, and then the water storage tanks are communicated into all rooms of a house. And a filter layer is arranged in the purification box. According to the utility model, the water collecting tank, the purification tank and the rainwater storage tank are arranged on the roof of the hotel, rainwater is collected and purified for flushing toilets and watering flowers in customer rooms in which the hotel room ischecked, and a water sour