Policemen look on in front of the US Embassy in Beijing on Wednesday. AFP
The trip by Pelosi, who is second in line to the presidency and the highest-profile elected US official to visit Taiwan in 25 years, has ignited a diplomatic firestorm.
She landed in Taiwan late on Tuesday in the wake of increasingly stark warnings from China, which considers the island a part of its territory to one day be reclaimed, by force if necessary.
China's Customs Administration said on Wednesday it would suspend some citrus fruits and fish imports from Taiwan over alleged "repeated" detection of excessive pesticide residue and positive coronavirus tests on packages.
In a separate notice, the Commerce Ministry added it would also "suspend the export of natural sand to Taiwan" from Wednesday, without providing details.
Customers buy fruit at a stall in Taipei, Taiwan. File/AP
It is not the first time Beijing has taken aim at Taiwan's exports.
China banned pineapple imports from the island in March 2021, citing the discovery of pests, in a move that was widely seen as politically driven.
Beijing has ramped up pressure on Taiwan since President Tsai Ing-wen took office in 2016, as she views the island as a de facto sovereign nation and not part of "one China".
On top of the latest bans, Taipei's Council of Agriculture said on Tuesday that China had cited regulatory breaches in suspending the import of other Taiwanese goods, including fishery products, tea and honey.
Meanwhile, Chinese authorities also announced planned live-fire military drills encircling Taiwan, in a move Taipei's defence ministry said threatened the island's key ports and urban areas.
At some points, the zone of Chinese operations will come within 20 kilometres (12.4 miles) of Taiwan's shoreline, according to coordinates shared by the People's Liberation Army.
Taiwan's 23 million people have long lived with the possibility of an invasion, but that threat has intensified under current President Xi Jinping, China's most assertive leader in a generation.