i will arrive in shanghai pudong airport 8 pm. is there a train to xuzhou?

Yes, the train is still in service. In SH Railway Station, the last high-speed train departs at 22:00. Considering that U have to spend 30-60min to check out, I suggest you take a taxi to the train station upon landing to catch the train. By the way, the last train for this route leaves from South Station at 22:20. You can also try to catch it.