Citing management rules in company contracts, Huawei said it "has decided to immediately terminate its employer relationship with Wang Weijing."
"Huawei has always abided by applicable laws and regulations of the country where it is located... and requires all employees to abide by the country's laws and regulations," it said.
Huawei's chief financial officer, Meng Wanzhou, who is also the daughter of the company's founder, was detained in Canada last month on a US extradition bid.
Her arrest follows US efforts to blacklist the company internationally over security concerns.
In apparent retaliation, China has since detained two Canadians -- a former diplomat and a business consultant -- on suspicion of endangering national security.