Sponge city garden water storage irrigation system

The invention relates to a sponge city garden water storage irrigation system which comprises a foundation layer. A mounting groove and a water storage groove are formed in the upper surface of the foundation layer, a filter screen layer, a gravel layer and a planting layer are arranged in the mounting groove, and an irrigation assembly is arranged on the foundation layer and comprises a water outlet pipe, a water suction pump and a water spray pipe; and one end of the water outlet pipe is provided with a first filter screen, a first washing assembly is arranged on the first filter screen andcomprises a first rotating shaft and a first cleaning brush, bristles of the first cleaning brush abut against the surface of the first filter screen, and a first driving assembly which rotates alongwith impact of water flow and drives the first rotating shaft to rotate is arranged in the water outlet pipe. In the application, the first filter screen plays a good filtering role, after the water flow enters the water outle