The invention relates to a method for controlling the effective aluminum in a zinc pot. Through detection of the current content of the effective aluminum in the zinc pot, the change of the aluminum content is determined; and through the preset type of zinc ingots, the corresponding addition amount is determined, and supplementation is conducted. By the adoption of the method for controlling the effective aluminum in the zinc pot, through stable control over the content of the effective aluminum, the generation amount of zinc slag is reduced, and along with reduction of the zinc slag, the amount of bonding slag on a sink roll can be reduced; and in this way, the replacement frequency of the sink roll can be reduced, and the continuous operation time of a unit is prolonged. Effective aluminum data in the zinc liquid can be directly, rapidly and conveniently obtained, it is not needed to wait for an analysis result of a laboratory, the expense of experiment analysis is reduced, and the work intensity of laboratory operating personnel is lightened. According to the display result of the effective aluminum, the type of added zinc ingots can be automatically selected based on the production variety and the current aluminum content, and the aluminum content is stably controlled.