This paper investigates stress corrosion behaviors of steel wires in coalmine under different polarization potential and different corrosive mediums simulated mine trickling water by using slow strain rate tests (SSRT). Stress corrosion cracking (SCC) mechanisms of steel wires were explored by comparisons of their mechanical properties, fracture morphology analysis and scanning polarization curve. The results show that steel wires under different corrosive mediums all present stress corrosion cracking (SCC) phenomenon, and the SCC susceptibility is the strongest in neutral solution. When applying strong anodic polarization potential, steel wires in acidic solution don't exhibit SCC phenomenon, while SCC in neutral and alkaline solution is controlled by anodic dissolution. With the decreasing of applied anodic potential, the SCC mechanism in alkaline solution is controlled by anodic dissolution and hydrogen embrittlement. In the self-corrosion area, SCC mechanisms of steel wires are all controlled by anodic dissolution and hydrogen embrittlement in three corrosive solutions with stronger SCC susceptibility. When the cathodic polarization potential is applied, SCC mechanisms under three corrosive mediums are mainly controlled by hydrogen embrittlement, and strong hydrogen evolution reaction enhances the SCC susceptibility.