Abstract Wind power on oceanic near‐inertial internal waves (WI ${W}{mathrm{I} }$) is one of the major energy sources to sustain ocean turbulent diapycnal mixing. However, its response to global warming remains poorly understood. Using a high‐resolution climate simulation that simulates WI ${W}{mathrm{I} }$ reasonably well, we show that under a high‐emission scenario, the quasi‐globally (5°–60° latitudes) integrated WI ${W}_{mathrm{I} }$ exhibits a significant negative trend of −5.1×10−2TW ${-}5.1times {10}^{-2},text{TW}$ per century during 2001–2100, decreasing by about 13% by the end of the 21st century compared to its present level. This decline is driven by reduced near‐inertial wind stress variance, primarily due to weakened mid‐latitude storm activities resulting from a poleward shift of storm tracks in both hemispheres and weakening of storm tracks in the Northern Hemisphere. Our findings suggest that near‐inertial internal waves should likely weaken in a warming climate, with important implications for ocean turbulent diapycnal mixing.