Do you mean Yiwu City? If so, you could take the airport shuttle bus from Pudong airprot to Yiwu. The bus departs at 17:10 and takes about 5 hours.
Well, you can also take subway line 2 from pudong airport to Hongqiao train station to take bullet train to Yiwu.

It is Wuyi, Zhejiang, less than 2 hours from Jinhua.
Alternately, do you know the times of trains going from Shanghai to Wuyi after 18:00?
Thank you

1.from shanghai to wuyi directly: go to shanghai South train Station , 23:57
and about 5 hours .
2.from shanghai to jinhua ,then from jinhua to wuyi by taxi
(1) shanghai railway station ; 18:20 , 3 hours.
(2) shanghai south railway station: many trains, 5 hours.
3.If you worry about from jinhua to wuyi for it is late,
you can also contace me.