A rain water purification system for sponge city construction

The utility model belongs to the technical field of sponge city construction, a a rain water purification system for sponge city construction is specifically disclosed. This system includes rainwaterinfiltration filtration, coagulating gas float tank, purification tank, cistern, the rainwater infiltration filtration includes splice groove, concatenation arch, limbers, filtering body, water purification line and the hole of permeating water, filtering body's front end fixed connection splice groove, and its rear end fixed connection splice the arch, is provided with the limbers inside it, andits upper portion is provided with the water purification line, filtering body is including gravel layer, activated carbon layer and the magnetic iron ore filter material layer of from top to bottom arranging in proper order, coagulating gas float tank with the limbers is linked together through the pipeline, and coagulating gas float tank passes through pipeline and purification tank intercommunication, and the bottom of