Police in southern China have seized more than 30 million yuan ($6.3 million) worth of counterfeit products, including large hauls of popular Australian-branded wines, vitamins, foods, and cosmetics.

Key points: China is the world leader in producing and exporting counterfeit goods, a report says

China is the world leader in producing and exporting counterfeit goods, a report says Some counterfeits sell for 1,000 per cent profit

Some counterfeits sell for 1,000 per cent profit China's rising middle class has led to increased demand for Australian-sourced foods

In two separate operations, police confiscated fake Penfolds wines and Swisse and Blackmores supplements, among other products.

Guangdong Police said in a statement they "destroyed" four criminal groups comprising 22 suspects during the investigation into the fake supplements over the past two months.

A dozen of those suspects have been charged and further investigations are underway.

In the other case, police said they seized about $2 million worth of wines and dismantled "a criminal chain" of 13 suspects who sold cases of fake Penfolds mixed with real bottles.

Police said the criminal chain formally registered companies that were in charge of different stages of the operation, and mostly sold the counterfeits through e-commerce websites and social media platforms including WeChat.

Some counterfeit products sold for a 1,000 per cent profit

Blackmores vitamins are popular with daigou shoppers. ( ABC News: Emily Stewart )

Local paper The Southern Metropolis Daily quoted Guangdong Police as saying that the criminal groups used tag lines such as "overseas direct sales" for products from Australia, and "direct postage from overseas and franchise stores", to attract customers.

Police added that some counterfeit products reportedly made about a 1,000 per cent profit, even though they were selling for a 50 per cent discount compared to the real product.

For example, the criminal chain selling fake Penfolds wines reportedly bought generic wines for some 19 yuan ($4) and sold them as the famed Australian brand for 200-300 yuan ($42-$62), which was significantly cheaper than the 600 yuan market price ($125).

A spokesman for Penfolds owner Treasury Wine Estates encouraged customers to seek out authorised retail stores to buy their wines.

The company's chief executive, Mike Clarke, told the Australian Financial Review earlier this year that it would stamp out operators who were producing copycat Penfolds wines.

The company has reportedly set up an internal investigations team and is working closely with authorities in China and Australia.

Counterfeiting rife as emerging middle class flexes spending power

The criminal group mixed real bottles of Penfolds with fake ones. ( Weibo: Guangdong Provincial Public Security Department )

China's rising middle class is driving increased demand for Australian-sourced foods and produce and a huge phenomenon known as "daigou", fuelled by a network of tens of thousands of shoppers who buy goods in Australian stores to send to relatives, friends and social media followers in China.

However, many Chinese consumers are being cheated, with fake products offered by dishonest daigous who not only sell knock-off products but also attach fake documentation purporting to show the products were bought overseas.

The fake Penfolds came complete with anti-counterfeiting labels. ( Weibo: Guangdong Provincial Public Security Department )

An Austrade spokesman said while there had been significant improvement in the ability to register and protect intellectual property in China, Austrade was aware of companies that had still suffered commercial losses.

"Austrade always urges businesses entering the China market to address this issue early on in the process," he said.

"That includes, where possible, registering trademarks, patents, copyright and trade secrets with relevant Chinese agencies."

Sophisticated anti-counterfeit and traceability technology is also providing new solutions, the spokesman said.

He pointed to the Adelaide-based Beston Global Food Company, which had developed a three-part traceability, anti-counterfeit and global e-commerce platform, in part based CSIRO technology.

"The system allows consumers to buy online and offline, trace the origin of products, and verify their authenticity," he said.

China is the world leader of counterfeit goods: report

China is estimated to be the source of more than 70 per cent of the world's physical trade-related counterfeiting. ( Weibo: Guangdong Provincial Public Security Department )

Counterfeit is rife around the world, but China is the world leader in producing and exporting counterfeit goods, according to a 2016 United States Chamber of Commerce report.

The report, titled Measuring the Magnitude of Global Counterfeiting, said China alone was estimated to be the source of more than 70 per cent of global physical trade-related counterfeiting, amounting to more than $US285 billion ($377 billion).

Last November, Chinese police raided a string of factories, warehouses and offices in an operation to crack down on counterfeit Peppa Pig products.

They seized toothbrushes, toothpaste and shampoo among other children's products branded with the British cartoon character that is hugely popular in China.

E-commerce giant Taobao, a subsidiary of Alibaba Group, is also fighting against counterfeits.

In the company's Annual Report of Intellectual Property Protection 2017, the group said they assisted Chinese police in arresting more than 1,600 suspects in the manufacturing and selling of counterfeit products and destroying more than 1,300 manufacturing sites.

The report said they also shut down 240,000 online shops which were suspect in selling counterfeits in 2017.

Additional translations for this story were done by Kai Feng, Asia Pacific Newsroom.