Percolation bed wetland system for bottomland of river channel, and operation method of percolation bed wetland system

The invention provides a percolation bed wetland system for bottomland of a river channel, and an operation method of the percolation bed wetland system. The percolation bed wetland system is arranged on a river beach and comprises a water taking system, a water distribution system, a percolation bed system, a water outlet system, a bottomland vegetation system and an operation control system, wherein the water taking system lifts and conveys water in the river channel to the water distribution system of percolation bed wetland, so the stable water treatment amount of the wetland system is ensured; the water distribution system is positioned on one side, higher in terrain, of the whole wetland system, so uniform water distribution of the wetland is ensured; and the percolation bed system is connected with the water distribution system, and water flows through the percolation bed system to be purified and lifted. According to the invention, the water body of the river channel can be purified and lifted by util