Building water circulation system

The invention provides a building water circulation system, and the system comprises a base; the top of the base is provided with a filtering assembly, and the filtering assembly is used for filtering suspended solids in domestic wastewater; an anaerobic assembly and a treatment assembly are respectively arranged on the outer side of the filter assembly, the treatment assembly is used for treating wastewater with excessive suspended solids, and the anaerobic assembly is used for treating wastewater with less suspended solids; the anaerobic assembly comprises a first vertical cylinder and a second vertical cylinder, and a first biological filler assembly and a second biological filler assembly are arranged in the first vertical cylinder and the second vertical cylinder respectively. According to the invention, organic solid wastes, suspended solids and other organic loads can be effectively intercepted in the anaerobic assembly and the treatment assembly for degradation, and then are further treated by the aer