In a statement on its website, China's Ministry of Commerce said the investigations will probe EU wine subsidies and their impact on the country's wine industry.
They are due to last one year, but may be extended by six months, and will abide by World Trade Organisation (WTO) rules.
"The Ministry of Commerce will follow the principles of openness, fairness and transparency, fully respect all parties' legal rights, and make a fair ruling based on objective fact and the relevant laws and regulations," the Ministry said.
Tensions between China and the EU have been escalating lately, with the EU imposing an average tariff of 11.8 percent on Chinese solar panel imports.
China has become the biggest importer of Bordeaux wines.
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