This study was designed to evaluate antioxidant activity of Curcuma longa L. leaves treated by ultra high pressure extraction. Curcuma longa L. leaves was subjected to 5,000 bar for 5 and 15 min at $25^{circ}C$ The highest phenolics and flavonoids content was observed in the treatment of high pressure extraction for 15 min ($308.28{mu}g/mg$, $124.33{mu}g/mg$). The DPPH scavenging activity was 82.34% at $1.0mg/m{ell}$ of Curcuma longa L. leaves treated by ultra high pressure process for 15 min. The highest SOD-like acitivity of Curcuma longa L. leaves ($1.0mg/m{ell}$) was observed at ultra high pressure extraction for 15 min (67.54%). The high pressure extraction significantly increased the contents of phenolics and flavonoids and also enhanced the antioxidant activity. These results provide useful information for enhancing biological properties of Curcuma longa L. leaves.