The invention relates to a method for removing copper and cadmium through boiling and purification. The method comprises the following steps of: adding activated copper and cadmium residue pulp into a zinc reduction boiling tank with copper and cadmium residues, overflowing the copper and cadmium residues into a copper and cadmium removing boiling tank after zinc in the copper and cadmium residues is reduced by neutral supernate, discharging bottom residues of 5m<3> to 10m<3> once every 4 hours, and feeding the bottom residues to a next procedure to restore copper and cadmium; continuously adding pulpified zinc powder into the copper and cadmium removing boiling tank, overflowing the pulpified zinc powder into a cadmium residue removing stirring tank, and discharging bottom residues of 5m<3> to 10m<3> once every 4 hours into a copper and cadmium residue activating stirring tank, wherein the quantity of the added pulpified zinc powder is accurately controlled by virtue of potential; and adding electrolytic liquid waste into the copper and cadmium residue activating stirring tank to adjust the pH value of the bottom residues in the tank to range from 3.5 to 4.5, and performing overflow and filter pressing on the bottom residues so as to overflow the bottom residues to a second section of purification cobalt. According to the method, the production process and the operation process are simple, the cost is low, the copper and the cadmium can be more effectively removed, and the consumption of the zinc powder is reduced.