Treatment method of copper secondary source smelting soot

The invention discloses a treatment method of copper secondary source smelting soot. According to the treatment method, copper secondary source smelting soot is subjected to pressure oxidation leaching in a low-concentration sodium hydroxide system, bromine enters the solution, tin subjected to pressure oxidation enters oxidation leaching residues together with copper and zinc, bromine entering the solution is subjected to pH regulation by oxalic acid and precipitated by lead acetate, and the solution is returned to a basic pressure oxidation leaching system; and tin, copper and zinc entering the oxidation leaching residues are leached by a sulfuric acid system, copper and zinc enter the solution and are further separated and extracted, and tin is enriched in the residue in a form of tin dioxide to be recovered and extracted. By adopting basic pressure oxidation leaching, efficient leaching of bromine in the copper secondary source smelting soot is realized, and the bromine leaching rate is more than or equal to 92%; by further oxidizing tin in the soot, dissolution of tin in the sulfuric acid system is inhibited, so that tin is easily separated from copper and zinc in the sulfuric acid leaching process; and by precipitating bromine with lead acetate, efficient bromine removal is realized, and the bromine precipitation rate is more than or equal to 95%.