A nonpoint pollution effluent purification system is provided to purify effluent fundamentally and substantially for preserving natural environment by filtering suspended materials or slit in rainwater. A nonpoint pollution effluent purification system includes a first sedimentation tank(110); a first filter member(120); a second sedimentation tank(130) leaking rainwater to a U shape, and forming a filter member(105); a second filter member(140); a cover covering the top of the first sedimentation tank and the second sedimentation tank respectively; and an ecology sewage disposal tank purifying rainwater in the second sedimentation tank.
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