The non-contact optical strain testing system was used to track and test the stress-strain curves of 2 060 MPa grade high-strength steel wire specimens throughout the entire process at 20-900 ℃. The mechanical performance index at high-temperature was determined， and the high-temperature fracture parameters of high-strength steel wire were obtained. The results indicate that the mechanical properties of high-strength steel wire specimens suffer various degrees of impairment at high-temperature. When the temperature does not exceed 200 ℃， the degradation of each mechanical property index of specimen shall not exceed 10%， and the fracture mode is brittle failure. After the temperature exceeds 200 ℃， the degradation of each mechanical property index of specimen significantly increases， and the fracture mode gradually changes from brittle failure to plastic failure.