The Chinese Communist party is extremely hostile towards Tsai's DPP, which it describes as "Taiwan independence elements" despite the fact that the party supports keeping the status quo in the Taiwan Strait.
The ban could weaken the DPP in local elections due in November, when voters typically focus on local economic, social and environmental issues.
In early 2021 China banned Taiwanese pineapples, a move that the Tsai government tackled with a viral campaign marketing the fruit as "freedom pineapples" and "democracy pineapples", helping to open alternative export markets.
Beijing has also blocked imports of wax apples and custard apples, and this year added grouper to the blacklist.
While China has long been an important export market for agricultural and fisheries products from Taiwan, those shipments total just US$200 million ($320.8m) a year — a fraction of Taiwan's overall exports to China.
The imports Beijing has suspended now cover 35 categories including fish and seafood, edible oils and biscuits and cakes, hitting publicly listed companies such as instant noodle and soy sauce producer Ve Wong and Chi Mei, which makes frozen foods.
Officials said they were still evaluating the potential damage of the Chinese move, but agreed that it would be sizeable.
China's customs administration made the import suspension public on its website by displaying "imports suspended" for those Taiwanese companies it said had failed to complete registration under new rules.
The Taiwanese government said it would help companies complete the registration, but added that it was not hopeful that this would lead to the ban being lifted.
Written by: Kathrin Hille
© Financial Times