I want to go to Guangzhou from Taizhou. where is the nearest place to get in to bullet train?

Jinhua can be a good transfer point. You can take a long-distance bus at General Bus Station to Jinhua within 3-3.5h. Then catch a high speed train to Guangzhou in 6.5h.

There is another way: take a coach from Luqiao to Wenzhou Airport, then fly to Guangzhou in 2h.