Can u please suggest me the best possible route from Delhi to Yiwu?

Well, you are suggested to take a direct plane from there to get to Shanghai Pudong International Airport first. Then at the airport, there are several direct coaches that can take you to the destination. The bus schedules are 09:00, 11:30, 14:10, 17:10 and 18:40. And the bus trip takes around 4.5 hours on the way.