The singer, whose band once represented the UK at the Eurovision Song Contest, made the announcement on ITV's Good Morning Britain.
He said: "I am so happy to be joining the team and I cannot wait to get started. I'm hopeful that Strictly Come Dancing will help me to improve on my daddy dancing skills.
"I want to make my daughter proud and no doubt she will be teaching me a pirouette or two along the way."
Webbe, who tested his dancing skills on the Strictly Christmas special in 2011 when he danced with professional partner Katya Virshilas, has a 17-year-old daughter.
He joins former rugby star Thom Evans, This Morning presenter Alison Hammond, Judy Murray and The Saturdays singer Frankie Bridge in the hit BBC ballroom show.
They will be joined by 10 other celebrities competing for the glitter ball trophy when the show returns to BBC1 this autumn.
The new series will be the first one without veteran host Sir Bruce Forsyth, with Tess Daly and Claudia Winkleman sharing the presenting job.