The world number three needed little more than an hour to wrap up the final against the second seeded Italian.
Vinci did threaten a comeback when she led 2-0 at the start of the second set, but Halep swept past her to march to the title - holding serve to love to close it out.
The Wimbledon semi-finalist will need to go some to match her 2013 season when she won six titles.
In Austria, Germany's Andrea Petkovic claimed the Bad Gastein title, ending the dream run of rising American star Shelby Rogers 6-3 6-3.
(Reporting by Martyn Herman, editing by Alan Baldwin)
- Sports & Recreation
- Simona Halep
- Roberta Vinci