The invention discloses a zinc ingot, which consists of the following components in percentage by weight: 0.48 to 0.52 percent of aluminum, not more than 0.02 percent of impurities, and the balance of zinc. By using the zinc ingot, the aluminum in a zinc solution can be kept in a proper range, and simultaneously, various defects caused by oversize fluctuation of the aluminum content in the zinc solution can be prevented or reduced.