"As a large and responsible state, China is not devaluing [its currency] to improve its competitiveness, and we are not going to use this as a tool to address trade tensions," Geng said at a briefing.
The spokesman also stressed that the US Department of Treasury had not listed China as a country that manipulates exchange rates for many years.
On Wednesday, Trump wrote on Twitter that China and Europe were manipulating their currencies and "pumping money" into their economies in order to successfully compete with the United States.
The United States and China have been trying to overcome disagreements that emerged in the wake of Trump’s decision last June to impose 25 percent tariffs on $50 billion worth of Chinese goods in a bid to fix the trade deficit. Since then, the two sides have exchanged several rounds of tariffs.
In May, the United States escalated the trade war when it imposed a 25 percent tariff on another $200 billion worth of Chinese goods. China, in turn, pledged to retaliate by hiking tariffs on $60 billion worth of US imports in June.