Energy-saving building water supply and drainage system

The invention relates to an energy-saving building water supply and drainage system, and relates to the technical field of water supply and drainage, the energy-saving building water supply and drainage system comprises a water collecting tank and a communicating pipe, the water collecting tank sequentially comprises a water collecting layer, a filtering layer and a water storage layer from top to bottom, one end of the communicating pipe is communicated with the water storage layer, and the other end of the communicating pipe is communicated with a pipeline system of a closestool. The rainwater collecting and recycling device has the effect of collecting and recycling rainwater. 本申请涉及一种节能型建筑给排水系统，涉及给排水的技术领域，其包括集水箱和连通管，所述集水箱由上至下依次包括集水层、过滤层以及储水层，所述连通管的一端与储水层连通，另一端连通于马桶的管路系统。本申请具有可以将雨水收集再利用的效果。