Three-stage treatment device and method of high-ammonia/nitrogen wastewater in alternate-flow artificial wetland

The invention relates to a three-stage treatment device and method of high-ammonia/nitrogen wastewater in an alternate-flow artificial wetland. The three-stage treatment device comprises a nanometer aeration ablation device, wherein a nanometer aeration disc connected with a nanometer aeration machine is arranged inside the nanometer aeration ablation device and located above a sludge outlet; the alternate-flow artificial wetland is connected to a surface-layer turbulence screen filter by virtue of a water outlet pipe; a water outlet of a water storage tank of the surface-layer turbulence screen filter is connected with a cyclone desanding device by virtue of a hydraulic pump; a sludge outlet is formed in the bottom of the cyclone desanding device, a stirrer is arranged at the top of the cyclone desanding device, impellers and paddles of the stirrer incline upwards and the upper part of the cyclone desanding device is connected with a backwash pump. The invention also discloses a three-stage deep treatment method of high-ammonia/nitrogen wastewater effluent by virtue of the combined device.