The utility model relates to the technical field of urban rainwater treatment, and discloses a multi-stage
water storage sponge facility which comprises a
perlite-containing fluffy plain soil layer, the lower side of the
perlite-containing fluffy plain soil layer is in contact connection with permeable
geotextile, the lower side of the permeable
geotextile is in contact connection with a gravel layer, the lower side of the gravel layer is in contact connection with a coarse sand layer, and the coarse sand layer is in contact connection with a
water storage layer. The lower layer of the coarse sand layer is in contact connection with anti-seepage geotechnical cloth, the lower side of the anti-seepage geotechnical cloth is fixedly connected with a drainage pipeline, a drainage groove is formed in the middle of the drainage pipeline, an overflow well is installed at one end of the drainage pipeline, an overflow
pipe is installed at the upper end of the overflow well, and a drainage opening is formed in the lower end of the overflow well. A
retaining wall is arranged on one side of the
perlite-containing fluffy plain soil layer, and a reinforcing
assembly is arranged on the upper side of the drainage pipeline. According to the utility model, the effect that rainwater rapidly infiltrates into a reservoir or a river or a lake is realized through good structures such as the perlite-containing fluffy plain soil layer, the permeable
geotextile, the
rubble layer, the coarse sand layer and the impermeable geotextile.