Polluted water submerged plant sediment habitat modifier, preparation method and sediment improvement method

The invention discloses a polluted water submerged plant sediment habitat modifier, a preparation method and a sediment improvement method, the method comprises the following steps: 1) spraying an aqueous solution of bentonite to the surface layer of a polluted water body, and standing for 24-48 hours after the addition is completed; 2) spraying an aqueous solution added with a bottom mud habitat modifier to the surface layer of the polluted water body; (3) planting corresponding submerged plants according to requirements; 4) secondarily spraying the water solution added with the bottom mud habitat modifier to the surface layer of the polluted water body; the habitat modifier is modified bentonite; the modified bentonite comprises bentonite and an iron-carbon nanolayer compound loaded on the surface layer of the bentonite, and iron is Fe3O4. The improvement method has the functions of water body adsorption, bottom mud isolation and pollutant degradation and transfer at the same time; the operation is simple a