Roof rainwater sewage interception purification system

The invention provides a roof rainwater sewage interception purification system, and relates to the field of rainwater purification treatment. The system can collect rainwater on buildings and conduct effective purification, and therefore urban roof rainwater is utilized more reasonably. The system comprises multiple vertical pipes, multiple purification devices, an overflow pipe and a hydraulic drop device, one purification device is connected to the portion between every two adjacent vertical pipes, a balcony branch pipe is connected to each vertical pipe and used for collecting the balcony rainwater, a roof branch pipe is connected to the uppermost vertical pipe and used for collecting the roof rainwater, the overflow pipe is communicated with each vertical pipe through a branch pipe, each branch pipe is provided with an intelligent on-off mechanism, and the bottommost vertical pipe and the overflow pipe are communicated with the hydraulic drop device on the lower portion to discharge the rainwater into th