Chinese foreign ministry spokesman Lu Kang told a press briefing that Beijing has lodged a formal protest with Washington and urged the US government to "uphold its solemn commitment to the One-China principle".
"Taiwan is an indispensable part of China's territory and we firmly oppose this arms sale to Taiwan," Lu said.
His comments come after China's embassy in the United States slammed the sale, saying it was a "wrong move" that would hurt relations between the two countries.
"It will harm the mutual trust and cooperation between China and the US."
Chinese President Xi Jinping met with his US counterpart Donald Trump at the billionaire's luxury resort in Florida in April.
Relations between the two countries had appeared to improve since the talks, with Trump hailing an "outstanding" relationship with Xi.
But there are signs the honeymoon might be over with Trump criticising China for not doing enough to get North Korea to abandon its nuclear ambitions and the US slapping sanctions on a Chinese bank accused of laundering North Korean cash.
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