The utility model discloses a residential area sponge urban facility system, including ecological grass planting ditch, concave -down green land, rainwater garden, rain drop tube and regulation pond, ecological grass planting linked up first drain pipe with the rainwater garden intercommunication, concave -down green land pass through the second drain pipe with the rainwater garden intercommunication, rainwater garden pass through the third drain pipe with regulation pond intercommunication, rain drop tube is located the lateral wall of building, rain drop tube's upper end intercommunication the roof of building, rain drop tube's lower extreme intercommunication ecological grass planting ditch or concave -down green land. The utility model discloses can absorb the roofing of district and the leading -in self -built sponge urban facility system of residential area of earth's surface footpath rainwater, purify and collect, not only alleviate the drainage system of residential quarter and the pressure of municipal pipe network, can also the water economy resource, water after the collection can directly be used for road and afforestation to spray etc..