The invention discloses a method for removing nitrate from a nickel copper cobalt sulfate solution, belongs to the technical field of nickel copper cobalt hydrometallurgy, and solves the problem thatthe nitrate in the nickel copper cobalt sulfate solution is difficult to remove. The method comprises the following steps: A, adjusting the pH value: adding a sulfuric acid solution for adjusting thepH value of the nickel copper cobalt sulfate solution to 1.0-2.0; B, extracting for removing nitrate ions: extracting by using an extracting organic phase to obtain a nitrate ion-containing supportedorganic phase and a sulfate-containing raffinate respectively, wherein an extractant in the extracting organic phase is N235. Selective extraction separation of the nitrate is achieved by using the N235, so that the nitrate ion removing rate is high, and the purity of the sulfate solution and the metal ion concentration can be maintained in the technological process.