Employees work on a national flag at Zhejiang Shaoxing Xiangying Textile Co in East China's Zhejiang province on June 12, 2016. [Photo/IC]

The largest order came from a Belgian beer merchant, who ordered more than 4 million flags months ago. The factory once spent 13 days producing more than 9 million flags during a previous sports event.

And it's not just Shaoxing-based company that has benefitted. Yiwu Bob Trading Co Ltd, based in Yiwu, Zhejiang province, produces more than 2 million soccer balls annually, most of which are exported. Before the opening of the Euro 2016, the factory saw a 30 percent increase in order. Now it is operating at full capacity, turning out more than 7,000 goods per day.