Rainwater ecological purification system

The utility model discloses a rainwater ecological purification system. The rainwater ecological purification system comprises a water cellar, a sedimentation water tank, a constructed wetland tank, a water collecting tank, a sand filtration pillar and a drinking water container which are sequentially connected with one another through pipelines, wherein the water collecting tank is connected with the sedimentation water tank through a pipeline; a first water pump is arranged on the pipeline between the water cellar and the sedimentation water tank; a second water pump is arranged on the pipeline between the water collecting tank and the sedimentation water tank; and a third water pump is arranged on the pipeline between the water collecting tank and the sand filtration pillar. During use of the rainwater ecological purification system, initial rainwater is collected in the water cellar, slowly-released drinking water disinfectant is added to the water cellar, and then rainwater in the water cellar is delivered to the sedimentation water tank through the water pump and enters the constructed wetland tank after sedimentation in the sedimentation water tank; through filtration of the constructed wetland tank and after degradation of organic pollutants by microorganism, the rainwater becomes clean water and enters the water collecting tank; and clean water in the water collecting tank is delivered to the sand filtration pillar through the water pump, after being filtered again through quartz sand in the sand filtration pillar, then the clean water finally becomes drinking water and enters the drinking water container.