The Australian world number one trailed his Scottish opponent 5-2 before fighting back to clinch the title 10-7 on Sunday.
"This is easily one of the proudest moments of my career," Robertson is quoted as saying by Sky Sports News. "The playing conditions here this week have been the best I have ever played in.
"I'll go to the Shanghai Masters in September full of confidence and there's no reason why I can't win three in a row in China."
It is the second title that Robertson has won this year following his triumph at the China Open in March.