The invention provides a nickel hydroxide raw material iron removing process and a pneumatic stirring and precipitating impurity removing tank adopting the nickel hydroxide raw material iron removing process. The nickel hydroxide raw material iron removing process includes the steps of pulpification, leaching and precipitation performed through a NaOH solution for impurity removal, wherein the iron content of the solution obtained after impurity removal is smaller than 0.001 g/L. According to the pneumatic stirring and precipitating impurity removing tank, an upper cover is provided with a top compressed air inflow pipe and a high-pressure air atomization spray gun. A lower cover is provided with a bottom compressed air inflow pipe. The manner that air flows in from the top and the bottom is adopted, stirring is more even, reactants make complete contact, and the lower cover is prevented from being blocked; and the high-pressure air atomization spray gun is arranged, so that feeding is more even, a reaction is performed faster and thoroughly, and when alkali liquor is added, the situation that the pH value of a local part is too high, so that a side reaction is generated is avoided.