Surface water purification and utilization system with elastic drainage function

The invention discloses an elastic drainage surface water purification and utilization system, and belongs to the field of sponge cities. An elastic drainage surface water purification and utilization system comprises: a water purification bucket located at a water inlet of a sewer of a road surface; the upper end opening of the water purifying barrel is lower than the road surface, and a gap is reserved between the water purifying barrel and the inner wall of the sewer to collect part of surface water entering the sewer; the water purification filter cover is detachably positioned in the opening in the upper end of the water purification barrel; the filtering area of the water purification filtering cover is not greater than the opening area of the water purification barrel; the water purification filter cover comprises a rough filter part and a fine filter part; the rough filtering part is used for filtering solid impurities in the surface water entering the water purifying barrel; the fine filtering piece