Floating wetland structure for rainwater runoff purification

The floating wetland structure comprises a first floating unit, a planting unit, a fixing unit and a channel, the first floating unit is provided with a first side face and a second side face in the thickness direction of the first floating unit, and when the first floating unit is arranged on the water surface, at least part of the first side face is located above the horizontal plane; the planting unit is arranged on the first side face of the first floating unit and used for planting plants. The fixing unit is arranged on the second side face of the first floating unit and comprises anti-corrosion wood, and the anti-corrosion wood is arranged on the two sides of the second side face in the length direction and/or the width direction; at least part of the channels are communicated with the first side face and the second side face of the first floating unit, and the channels are used as rainwater runoff channels and/or provide space for root growth of plants. The first floating unit comprises a plurality of