From shanghai pudong airport to yiwu you can choose route as following:
1. Car service: will cost you $120 (around 800rmb),
2. If you want to by high speed train, first from shanghai pudong airport to shanghai hongqiao railway station by subway line2, pass 28 stations, it will takes1.5hours.
Hongqiao airport also have airport bus to hongqiao railway station, but will takes around 2 hours, maybe will get stuck in traffic jams.
3. If by taxi, you will spend around rmb200, i think if you have time, subway is best choice for you.
4. from shanghai hongqiao railway station to yiwu train station time as following :