Ecological wetland purification structure for small river channel estuary shoal

The utility model discloses a small river channel estuary shoal ecological wetland purification structure, and relates to the technical field of wetland purification structures. The device comprises a river channel, river banks are constructed on the two sides of the river channel, each river bank comprises a gravel foundation pile arranged towards the river mouth of the river channel, a tree planting layer is arranged on each gravel foundation pile, and grass planting ditches are formed in the ends, opposite to the river mouth of the river channel, of the tree planting layers in an array mode; and the flood drainage mechanism comprises a plurality of water inlet pipes inserted in the grass planting ditch, an impurity removal filter plate is rotationally installed at the top of each water inlet pipe, a drainage pipe is horizontally installed in the gravel foundation pile in a penetrating mode, and the bottom ends of the water inlet pipes communicate with the drainage pipe. The flood discharge mechanisms are a