The invention discloses a method for recycling waste liquor of zinc plating using potassium salt in a laboratory and relates to the field of comprehensive utilization of waste liquor in the field of plating. The method comprises the following steps of: adding hydrogen peroxide and activated carbon into the waste liquor to remove organic impurities from the waste liquor; then reducing the temperature of the solution by using a refrigeration sheet, and filtering out solid in the solution; adding NaOH solid and NaHSO3 into the solution; precipitating heavy metal elements in the solution out through chemical reaction; and finally distilling to obtain distilled water. By the method, recoverable substances, such as distilled water, boric acid and the like in the waste liquor can be recycled, and unrecoverable substances, such as heavy metal ions (Cu<2+> and Cr<3+>) are subjected to innocent treatment by a deep burying method. The invention provides a simple and practical method, by which resources can be effectively recycled and pollution can be reduced, for treating the waste liquor of zinc plating using potassium salt in the laboratory.