The Better Homes and Gardens builder, whose partner in the Australian reality show was professional dancer Alana Patience, beat singer Tamara Jaber by scoring three perfect ten scores from the judges in the freestyle dance-off.
Palmer told the Herald Sun: "I'm thrilled to bits. I did not give myself a snowball's chance in hell. I feel like someone has put sprinkles on my oats for the past two weeks, that is what Dancing has been like.
"I'm not sad yet, but I think I will be sad tomorrow because when you win something that means it is over and I really have had an amazing time."
He also said that he was "not feeling much of anything" after taking some painkillers for his injured back before the show.