Pyrite roasting slag containing Iow-grade copper and cobalt poses challenges in the selective recovery of valuable metals due to its fine-grained texture and complex mineral composition. This study employs ammonium salt roasting-water leachino to selectivelv recover copper and cobalt. The effects of roasting temperature. roasting time. water leaching time, water leaching temperature, liquid-solid ratio, and stirring rate on Cu and Co leaching rates were systema tically investigated. Cu anl Co leaching efficiencies reached 68.78 % and 60.16 %, respectively, under the conditions:20 % ammonium sulfate dosage, roasting at 350 °C for 120 min, followed by leaching at a liquid-solid ratio of 7:1.temperature of 60 °C, 400 r/min stirring rate for 120 min. Mechanisms of Cu and Co recovery were explored via SEM-EDS. thermogravimetric-different thermal analysis, chemical phase analysis, and leaching kinetics. The roasted sample exhibits a porous and loose su rface structure. During the roasting process. amms ium sulfate reacts with copper oxide.сopper sulfide, and cobalt sulfide during roasting to form soluble copper sulfate and cobalt sulfate, while cobalt tetroxide is reduced to cobalt sulfate, enhancing metal leaching.