Athens gold medallist Park Sung-hyun, world No.1 Yun Ok-hee and Joo Hyun-jung beat the Chinese trio 224-215 to confirm their status as the sport's superpower.
The Koreans, who set a world record against Italy in the quarter-finals and hammered France in the semis, have won every Olympic archery gold medal since 1984.
France beat Britain by a point to win the bronze medal after driving rain and thunder forced a 15-minute postponement.
Park, who ripped gold from China's grasp with her very last arrow four years ago, was in imperious form, shrugging off miserable conditions and heckling from the home crowd to lead her team to victory.
China's Chen Ling, Guo Dan and Zhang Juan Juan were never able to get back on level terms with the Koreans after falling behind with their first three arrows.