The pair was arrested by the country's Internal Security Agency on Tuesday and hit with espionage charges, according to a release from the agency.
The Chinese Foreign Ministry said Friday that it has asked Poland to handle the case fairly and protect the rights and safety of the Chinese suspect.
Along with the Chinese national, whose name has been reported as Weijinga W., the Polish counterintelligence service, the Internal Security Agency (ABW), arrested Polish national Piotr D., the ABW's own former employee, Polish broadcaster TVP.
Huawei is one of the "tech" champions in China, and one of the more popular Chinese companies overseas. If found guilty, the two face up to 10 years in prison.
Huawei said in a statement: "We are aware of the situation, and we are looking into it".
This is the second incident after Huawei's CFO got arrested in Canada.
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The detentions come amid the Chinese tech company coming under western scrutiny for being linked to China's government and having equipment which could contain "backdoors" for use by government spies.
Wang is a graduate of the Beijing University of Foreign Studies who formerly worked in China's consulate in Gdansk, according to his LinkedIn page. Various countries, including the Britain, France, Germany, Norway, have publicly raised concerns about using Huawei equipment for next-generation mobile networks.
Huawei chief financial officer Meng Wanzhou (孟晚舟) was last month arrested in Canada on request from the United States, which suspects her of breaching Iranian sanctions. It sells more smartphones than Apple (AAPL) and builds advanced telecommunications networks in countries around the world. Orange told the AP it did not know if the suspicions against its employee were related to his work at Orange.
But some governments are moving to block the Chinese firm, with Norway becoming the latest country to exclude Huawei from its 5G infrastructure plans.
Huawei has rejected Western concerns, saying there was "no evidence" that it poses a threat to the national security of any country. She is out on bail in Canada awaiting extradition proceedings.
Canada's arrest of Meng, and China's apparent retaliation in detaining up to 13 Canadian citizens in China, including a former diplomat Michael Kovrig and North Korean consultant Michael Spavor, has soured bilateral relations.
The accusations add to Huawei's troubles of late as Western governments grow anxious that Huawei's systems could be used by Chinese intelligence.