The programme, which airs in the autumn, claims to bring the unpredictability and big money gamble of the casino into a gameshow studio.
A five-reel slot machine called Moneyspinner is the focus of the show, with questions, cash and contestants' names on the reels.
People will take it in turns to win large amounts of cash for that episode's Spin Star, who is in charge of the giant slot machine. The contestants will rotate during the week so they all have the opportunity to be the Spin Star.
Speaking about his new project, Walsh said: "I am delighted to be presenting Spin Star. It's such an incredibly entertaining show with lots of surprises in store for the contestants and viewers."
ITV1 Controller of Daytime Adam MacDonald added: "Spin Star is a deceptively clever quiz format and Bradley is brilliant as its host."