Water purification type ecological bank protection overflow system

The invention relates to a water purification type ecological bank protection overflow system. The ecological bank protection overflow system comprises a water diversion transverse furrow, a speed reduction weir, reaction tanks and a gabion bank revetment, all of which are sequentially arranged in the direction from the slope face to the water face. Isolation layers are arranged on the side faces of the reaction tanks. The reaction tanks are sequentially provided with planting layers, adsorption-nitrification layers, rubble layers and anaerobic-denitrification layers from top to bottom, and overflowing pipes inclined downwards in the direction of the water face are arranged in the rubble layers. According to the water purification type ecological bank protection overflow system, the staying time of non-point pollutants in water of all layers of structures of the ecological bank protection overflow system is controlled by reducing the radial flow speed of the non-point pollutants on the riverway slope face, the non-point pollutants can naturally and orderly be subjected to the work processes of permeating, absorbing, decomposing, converting and discharging in the system, and the aim of efficient purification of the non-point pollutants is finally achieved.