Any Chinese citizen who put up a 1,000 yuan (USD 159) deposit was qualified to bid.
Starting at 10 am (local time) on Wednesday, at least 48 bidders took part in the auction.
Except for the UK property, which had a starting price of 4 million yuan and was not sold, the other three islands had a starting price of only 1 yuan.
The island in Fiji was sold with 99-year rental property rights while the others were sold freehold, state-run China Daily reported.
A businessman in Zhejiang province bought the island in Fiji for 5 million yuan, according to Beijing-based Ilongterm, the real estate firm that held the auction.
"We chose to work with Taobao as a strategic partner, because it is undoubtedly the most influential online shopping platform in China right now. Our bidders in this auction were long-time users of Taobao who have spent about 10 million yuan on it" so far, Ilongterm said.
The company will also offer more overseas properties by auction on Taobao later this month and in May.
Taobao started auctions for overseas properties on December 12.
"We are catering to rising demand for overseas properties among these groups. We're sure to offer more such projects in the future," said Taobao in a written reply.
According to Lin Dong, founder of the China Island Owners Association, wealthy Chinese have shown growing interest in overseas islands in recent years.
Wealthy Chinese bought at least seven overseas islands in 2014.
