I would like to know the fastest and cheap way to travel to Huangshan from Tianjin university?

Dear, mulan.
The flight is suggested. But you need go to the airport first from the university. From the university, you need walk to Qilitai Station to take bus no. 662 and get off at Xinanlou Station. There you can take airport shuttle line 5 to the airport directly.
Then you can take the flight to your destination. The flying duration is about 2 h, and the ticket fare is around 570RMB.