Sponge step ladder type water purification ecological bank protection system

The invention discloses a sponge step ladder type water purification ecological bank protection system which comprises a front sunken greenbelt, a filter screen, a step ladder type unpowered rough surface overflow wall, a water collecting tank, a water purification unit and a hydrophilic unit, and is characterized in that the step ladder type unpowered rough surface overflow wall is arranged on the side wall, close to a river channel, of the front sunken greenbelt; the surface of the step ladder type unpowered rough surface overflow wall is arranged to be of a brick concrete structure densely embedded with pebbles, in the whole sponge step ladder type water purification ecological bank protection system, a solid pipeline structure is not arranged, extra power is not needed, energy-saving and low-carbon operation is achieved, the system is built according to the terrain, runoff is fully purified after flowing through the system under the action of gravity, and the water purification effect is good. And supplyi