The company dismissed Wang Weijing, saying the incident had brought its name into disrepute. It acted before judges heard Weijing's plea on the alleged charges.
Bloomberg quoted Brock Silvers, the managing director of Kaiyuan Capital, as saying the incident could have "a very significant impact" on Huawei's business in Europe.
"Regardless of how the allegations against Wang are ultimately resolved, it seems likely that Huawei’s important European business will suffer in 2019," he said.
A Chinese foreign ministry spokeswoman told a regular news conference in Beijing on Monday that Weijing's case was an individual one.A Chinese foreign ministry spokeswoman told a regular news conference in Beijing on Monday that Weijing's case was an individual one.
Hua Chunying said: "Both the relevant Polish side and Huawei have said in their statements that the case of Wang Weijing is entirely an individual one.
"The Polish side should arrange for a consular visit by the Chinese side immediately, handle this case in accordance with the law and regulations on the basis of facts, and earnestly safeguard the legitimate and legal interests and humanitarian treatment of the person involved."
The US has banned the use of Huawei equipment in its 5G networks, claiming that the company can be a conduit for spying by Beijing. Australia and New Zealand have both followed the US lead and banned the company from roles in their respective 5G rollouts.
In November 2018, there were reports that the US was stepping up the pressure on its allies to give the cold shoulder to the Chinese firm which is the world's biggest supplier of telecommunications equipment.