Method for directionally and deeply treating nitrate radicals in water body

The invention discloses a method for directionally and deeply treating nitrate radicals in a water body, which comprises the following steps: adjusting the pH value of the nitrate-containing water body, filtering, and passing the obtained filtrate through an adsorption tower or a fluidized bed filled with an ethylenediamine resin-based loaded zero-valent palladium-tin bimetallic nano composite material to obtain the treated water body, when a leakage point is reached, a sodium borohydride solution is used for reduction regeneration. According to the method disclosed by the invention, nitrate is treated by using the ethylenediamine resin-based loaded zero-valent palladium-tin bimetallic nano composite material, and when the pH value of a water body is 3.0-11.0 and inorganic anions such as high-concentration chloride ions, bicarbonate radical ions and sulfate radicals coexist, the nitrate content of the effluent is still reduced from less than 200 mg/L (in terms of N) to less than 0.01 mg/L, so that the content