Waste water focus utilization system for high-rise residential buildings

The utility model discloses a waste water focus utilization system for high-rise residential buildings. The waste water focus utilization system comprises a rain water tank, and at least two dual-U-shaped pipe units sequentially arranged from top downwards, wherein each dual-U-shaped pipe unit comprises a water collecting pipe, a water storage pipe, an overflow pipe, a Y-shaped three-way pipe, a water outlet pipe, a blow-off pipe and a purifying device; the tops of the water collecting pipes of the topmost dual-U-shaped pipe units among all the dual-U-shaped pipe units are communicated with the rain water tank; and the overflow pipe of the previous dual-U-shaped pipe unit is communicated with the water collecting pipe of the next dual-U-shaped pipe unit. The three-way pipes in the system are connected with partial sanitary wastewater of a residential building to collect the partial sanitary wastewater of the residential building and rainwater from balconies; and the collected water flows through the dual-U-sh