Buffer zone protective isolation area surface runoff collection and purification system

The invention provides a buffer zone protective isolation area surface runoff collection and purification system. The purification system is composed of a lawn system, a runoff guiding system and a runoff stagnation system. The buffer zone protective isolation area surface runoff collection and purification system is mainly applied to quick interception and purification of runoff contaminants in a buffer zone protective isolation area of a river or lake to promote ecological functions in the area and reduce the load of the river or lake which the contaminants flow into. The system is used in a newly built area for returning farmland to woodland in a target region, and materials in use are free of any ecological risks; moreover, design is simple, investment is small, and maintenance is easy.