Lake-based farmland return water purification and ecological regulation and storage system

The utility model provides a lake-based farmland return water purification and ecological regulation and storage system. The lake-based farmland return water purification and ecological regulation andstorage system comprises an interception purification zone, a regulation and storage recycling zone, a pump station, an overflow weir and a check gate, the interception purification zone is located on the outermost side of the farmland return water upstream face; the regulation, storage and recycling zone is adjacent to the interception and purification zone, aquatic plants are planted at the bottom of the regulation, storage and recycling zone and on the bank slope, and aquatic organisms are further cultured in the regulation, storage and recycling zone; the pump station is arranged beside the impounding and purifying belt and used for recharging the farmland, and a water source for water lifting irrigation is farmland return water purified by the regulation and storage recycling belt; the overflow weir is arran