The invention discloses a method capable of being used for rain water seepage-filtering, collection and storage and purification in a sponge city.The method comprises the steps of firstly, selecting an appropriate position, excavating a foundation pit of a biological detention pond and water storage wells, and laying open vertical-rim stone strips 5-10 cm away from the two sides of the road surface of the biological detention pond.The biological detention pond comprises a rubble cover layer, a vegetation planting soil layer, a charcoal filler layer and a gravel drainage layer in sequence from top to bottom, and seepage-proof films are laid at the periphery and the bottom of the biological detention pond.An overflow pipe is laid on the gravel drainage layer, an overflow port in the upper end is 5-10 cm higher than the rubble cover layer, and the lower end is connected with a municipal drainage pipe network.The system can be applied to the places such as a residential area, a campus, a parking lot, a park and a road, rainwater can be collected and stored, the content of pollutants such as nitrogen, phosphorus and heavy metal in the rainwater can be reduced, the recycling purpose is achieved, finally, urban inland inundation is effectively alleviated, and rainwater utilization efficiency is improved.