Hello.Mr.Quyuen Ma
As far as i know, it is not possible for you to keep your luggages at foothill of Huangshan as no such service is available. You can take cable car to go up with your luggage. It is said that mountaineers at foothill can do that for tourists but they charge a lot.
Single ticket for cable car cost CNY80. You may read this page for the introduction for Huangshan scenic spot:
https://www.travelchinaguide.com/attraction/anhui/huangshan/huangshan.htm

Thanks you very much Mr Ross, your information plus link really make sense!
On the other hands, is there any locker service in Tunxi Town instead (near Tunxi bus station)

Sorry for bothering again :-)

Hello,again.Mr.Quyen Ma
This time you are right. Left Luggage service is available at Tunxi Bus Station. It is said to in the waiting hall. You can keep your luggage as long as 10 days. The fare is CNY5 for each item for one day.

I really appreciate your replies, thank you!