Sponge city road rainwater collection method

The invention discloses a sponge city road rainwater collection method which comprises the following steps: rainwater enters a filter cartridge through a water inlet pipe, the rainwater filtered by the filter cartridge flows into a gravel filter layer below after being shunted and decelerated by a shunting assembly on a flow guide pipe, and the rainwater is stored in a reservoir after being secondarily filtered by the gravel filter layer; a control valve is arranged at the bottom in the filter cartridge, and rainwater washes the filter cartridge and flushes impurities in the filter cartridge into the pollution discharge unit when the control valve is opened. Rainwater is filtered by installing the filter cartridge in the ground surface, the filtered rainwater enters the reservoir below through the drainage unit, when many impurities exist in the filter cartridge, the filter cartridge can be washed by the rainwater, sewage is discharged into a municipal sewage discharge system through the wastewater unit, the