World No 1 An Se-young got the party started in Hangzhou in rampant fashion when she defeated Chen Yufei 21-12, 21-13 in double-quick time.
Next, Lee So-hee and Baek Hana beat Jia Yifan and Chen Qingchen 21-18, 21-14 in the doubles, before Kim Ga-eun sealed the deal with a hard-fought 23-21, 21-17 victory over He Bingjiao.
That sparked wild celebrations from the South Korean players on the sidelines, who sprinted onto the court. At least two were in tears.
South Korea's coach Kim Hak-kyun called the gold "precious" and said they were already targeting more success at next summer's Paris Olympics.
"This is thanks to the determination, mindset, mentality and unity of our players," said Kim.
"They are at their peak, but we are still moving forward and our target is beyond Asia and looking at the Olympics."
China's coach Xia Xuanze said the home team were tired and would need to quickly pick themselves up, with singles and doubles golds still up for grabs later in the Games.
"Because we are playing at home, in an event that happens only every four years, of course we face a lot of pressure," said Xia.
"But there is also the incentive of playing at home.
"It was not about pressure today, but at key moments we couldn't grasp the opportunities.
"Because we didn't win gold today, our athletes' mindset will be affected for sure."