Rainwater-collecting and contaminant-intercepting system for environment-friendly residential building

The utility model discloses a rainwater-collecting and contaminant-intercepting system for an environment-friendly residential building. The rainwater-collecting and contaminant-intercepting system for the environment-friendly residential building is formed by serially connecting a plurality of subsystems in a low green land in a residential community, wherein each subsystem consists of a contaminant-intercepting and infiltration subsystem and a routing infiltration and drainage subsystem. In the flowing process of rainwater in the rainwater-collecting and contaminant-intercepting system for the environment-friendly residential building, rainwater is accumulated, stored, infiltrated and retained and energy is consumed, so that the amount of rainwater drained at the tail end is significantly reduced; in the infiltrating process of rainwater in a water-permeable filler layer, a water-retaining garden planting soil layer and a filler layer thereof, and a filler layer of a filler well which are outside the rainwater-collecting and contaminant-intercepting system for the environment-friendly residential building, rainwater is adsorbed, filtered and retained, carries contaminants and effectively removes the contaminants; and at the tail end of the rainwater-collecting and contaminant-intercepting system for the environment-friendly residential building, the amount and quality of collected rainwater are controlled and the rainwater at the tail end can be collected for recycle or drained into a municipal rainwater pipe network. The rainwater-collecting and contaminant-intercepting system for the environment-friendly residential building prolongs the flowing time of rainwater in the draining process, can reduce the amount of urban rainwater in a flood peak, can beautify an urban living environment and can maintain the balance of a natural hydrological cycle.