Taking the graphite carbon rod with pyrite embedded as the working electrode,the oxidation process of pyrite in CoCl₂ solutions of varying concentrations and the 5 mmol/L CoCl₂ solutions at different potentials was discussed from the perspective of electrochemistry by using electrochemical means such as open circuit potential,cyclic voltammetry,Tafel curve,electrochemical impedance spectroscopy.The results showed that pyrite is most likely to be corroded in 9 mmol/L CoCl₂ solutions under the conditions of pH=1.0;under the conditions of pH=1.0,CoCl₂ concentration of 5 mmol/L and a potential range of 0.4-0.8 V,the oxidation capacity of pyrite first decreases and then increases,and reaches the weakest at 0.6 V,and the oxidation capacity of pyrite at  higher potentials is stronger than that at lower potentials.