The Scot started the day four shots behind overnight co-leaders Scott Henry and Victor Perez and began to climb the leaderboard immediately by driving the green on the 336-yard par four second before going on to hole the eagle putt.
After reaching the turn in 33 Hill made his move over the back nine, reeling off four birdies in eight holes before narrowly missing an eagle putt on the 18th.
The 23 year old tapped in for birdie to reach 19 under par overall, and after Henry dropped four shots over his closing three holes it was Hill who was crowned champion.
Making just his fifth Challenge Tour start this week, Hill admitted he was lost for words following his one-shot triumph.
“I can’t believe it,” he said. “On the stretch I was hitting a few great shots and was holing a few great putts but I thought it would be for second or third place – not for the victory.
“I really narrowly missed a putt on 18 for eagle which was just hanging over the edge – I thought that would make it interesting as Scott was 22 under when I was going down 17 and I made a birdie to get to 18 under. I didn’t even think it would be close.