The invention discloses a method for removing chloride from an alkaline zinc solution, relates to a process for removing impurities such as chloride ion and the like from a process for producing high-purity metallic zinc by taking zinc oxide ore, powder or slag as a raw material through alkaline leaching-electrolysis. The method comprises the following steps: NaOH and the zinc oxide are added with stirring to the alkaline zinc solution the Cl<-> concentration of which is more than 70g/L, or/and the solution is heated for concentration to increase the NaOH concentration to 400-600g/L and the Zn concentration to 60-120g/L; the mixture is cooled to normal temperature, continuously stirred for 20-60min and kept standing for 40-120min during which a large amount of chloride is crystallized andseparated out from the solution because of the sharp decrease of the solubility; then the solid is separated from the liquid, and filtrate is diluted with water and adjusted to the alkaline zinc concentration level before purification, so that the Cl<-> concentration decrease to less than 5g/L and the impurity ions such as Fe, Cu, As, Cd and the like in the solution are also removed at the same time, which meets the requirements of the subsequent electrolysis process operation; and purification slag is sold to the chlor-alkali industry as a raw material. The method has the advantages of significant Cl<-> removal effect, simple operation and the like, thoroughly solves the problem of causing damage to the zinc electrowinning and extracting from the alkaline zinc solution due to continuous accumulation of the Cl<-> impurity.