The commerce ministry "decided to approve" the sale on condition that SABMiller's own stake in China's biggest brewery was disposed of, its anti-monopoly bureau said in a statement on its website -- a transaction which has already been agreed.
The takeover has previously been approved by regulators in the US, European Union and South Africa, where SABMiller has its origins.
AB InBev has agreed to a series of concessions to win the authorities' green lights, including selling SABMiller's 49 per cent stake in Snow Breweries, China's biggest beermaker.
Otherwise, it said, the deal "would have the effect of eliminating and restricting competition, and ultimately would harm the interests of Chinese consumers".
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AB InBev is already the world's top brewer and the SABMiller acquisition is in line to be the third largest in history if it goes through.
The Belgium-based brewer of Budweiser and Stella Artois this week raised its offer for SABMiller to 45 pounds a share, after sterling slumped following Britain's Brexit vote, cutting the value of the deal to global investors when measured in other currencies and triggering shareholder resistance.