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Three pairs performed at the team's internal competitions on Friday.
Cao, 26, becomes the first athlete to win gold in all three diving disciplines, having taken the 3m springboard top spot in Rio and the 10m synchronised in London.
At the 2019 World Championships, Chen Yuxi won the women's 10-meter platform championship at the age of 13 years old.
He once said that Jinan was not the new starting point of his life, but it also helped him broaden his views towards the world.
Bronze went to Britain's Tom Daley, who was back on the podium after an emotional gold medal win in the men's 10m synchronised last week.