Lake city near-water space bank slope rain and sewage separation and purification method and device

The invention discloses a method and a device for separating and purifying rain and sewage on a bank slope of a waterside space of a lakeside city, the device comprises a bank slope main body, the bank slope main body is provided with a greening and road area, and the road area of the bank slope main body is provided with a plurality of drainage mechanisms for draining rainwater. A water seepage brick groove is formed in the position, located in the downhill area of the drainage mechanism, of the bank slope body, purification green plants are arranged on the water seepage brick groove and the bank slope, the drainage mechanism comprises a drainage well lid arranged above the bank slope road area, and a blocking frame used for blocking a water outlet channel of the drainage well lid is arranged below the drainage well lid. The drainage mechanism, the drainage well lid, the plugging frame, the connecting sleeve, the supporting inner rod and the reset spring are arranged, the connecting sleeve is driven by the r