The invention discloses a sponge city bioretention zone, the sponge city bioretention zone is characterized by comprising a filler improved soil layer, a sand filter layer, a geotextile layer and a gravel layer which are sequentially arranged from top to bottom, wherein a water storage area is arranged above the filler improved soil layer, a permeable pipe is arranged at the bottom of the gravel layer, the filler improved soil layer comprises locally-obtained soil and vermiculite or zeolite, and the mass percentage ratio of the soil to the vermiculite or zeolite is 60%-70%: 30%-40%. Accordingto the sponge city road bioretention zone, zeolite and vermiculite filler improved soil serves as a filler, the pollutant removal effect is obvious, the effects of preventing soil hardening and improving the regulation and storage functions of the bioretention zone are achieved, the later maintenance cost is reduced, materials are easy to obtain, and the sponge city road bioretention zone has great application and popularization value.