Twenty-five-year-old Turner has been rewarded with a new deal after bouncing back from a serious 2015 neck injury to establish a first grade spot at the Rabbitohs.
Despite the challenges, South Sydney coach Michael Maguire predicted a long journey ahead for the revitalised Turner.
"Kyle has worked very hard to get to where he is now in his career, and we think we're yet to see the best of him," Maguire said.
"He works very hard every day to get the best out of himself and his teammates, he has the right attitude to make a success of his time in football and we've seen how resilient he is coming back from his neck injury.
"His leadership qualities are starting to shine through and he is becoming a strong leader within the club."
Indigenous All Star Turner has played 56 NRL games for the Rabbitohs since his 2014 first grade debut.
"I love playing here at Souths with this bunch of boys and I couldn't be happier about re-signing," Turner said.
"I'm really looking forward to the years ahead."
The backrower feared the worst when his neck was damaged in a crunching Paul Gallen tackle in the All Stars game two years ago.
He had a titanium plate inserted in his vertebrae and made his return in round 21 2015.
He has since conceded another neck injury may end his career.
The Rabbitohs host Sydney Roosters on Thursday night.