Luatua has signed a two year contract extension with the Bristol Bears, keeping him with the Premiership club until 2021.
The 27-year-old joined the club for the 2017-18 season from the Blues and has made 23 appearances.
"It's a privilege to commit my future - it's an environment that is getting the best of out of me," Luatua said.
"There is huge ambition at the club to keep progressing and getting better, I'm excited to be a part of that."
New Zealand international Luatua won 15 caps for New Zealand between 2013 and 2016 and also worked with head coach Pat Lam during his time at the Blues.
He made 74 appearance for the Blues between 2012 and 2017.
"Steve is a pivotal character for us, on and off the field. His influence around the training ground and his performances on the field have earned him the respect of players, staff and supporters," Lam said.
"Securing his commitment at this early stage underlines the belief that we have within the club about what we can achieve. We're looking forward to seeing Steve continue to drive our progress towards our vision."
Bristol are currently tenth in the Premiership with three wins and seven losses.