Allen hit an impressive 14 centuries over the course of the tournament, with four of those coming in an extraordinarily high-standard final against Robertson in Daqing on Sunday.
The Northern Irishman built up a daunting 7-1 lead as he dominated the morning session, with breaks of 108, 103 and 119 prompting applause of appreciation from the Chinese crowd.
Robertson, to his credit, looked in fine fettle himself when at the table, with breaks of 93, 84 and 121 after the interval giving him hope of a comeback.
Watch Roberton's lovely double against Lisowski
Robertson launches unlikely comeback with century clearance
But Allen held his nerve in a tense 15th frame that saw Roberson play a number of excellent safety shots to try and force a mistake.
The 32-year-old Allen also picked up the prize for the tournament's highest break thanks to his 146 in the second round against Hossein Vafaei.
Allen and Robertson are back in action this week at the Champion of Champions tournament in Coventry.
Watch Roberton finish off classy century break to stretch lead over Lisowski
Robertson seals spot in final with sharp break