The invention discloses a
sponge city rainwater collecting, purifying and utilizing
combination system which comprises a roof rainwater collecting area, a road rainwater collecting area, a greenbelt rainwater collecting area, a water collecting and sand
settling tank, a purifying device and an impounding reservoir. An
evaporation preventing layer, a soil layer, a
water supply layer and a purifying layer are sequentially arranged on the roof rainwater collecting area from top to bottom. Transverse and longitudinal water collecting pipes are arranged in a bottom gravel layer of the road rainwater collecting area. An
evaporation preventing layer, a soil layer, a rough sand layer and a purifying layer are sequentially arranged in the greenbelt rainwater collecting area from top to bottom. A filtering grid is arranged in the middle of the impounding reservoir, a water inlet hole and a water overflow hole are formed in the upper portion of the impounding reservoir, and a water drawing pump is arranged at the bottom of the impounding reservoir. The
city environment can be greened and beautified, city rainfall flood pressure can be relieved, pollutants in rainwater can be absorbed,
water resources can be saved, the rainwater utilization efficiency can be improved, and important reference significance is achieved on
sponge city non-
point source pollution control and city water shortage relieving.