The 1997 movie will be released on April 6, 2012, to tie in with 100 years since the real-life ship sailed for the first time but sunk on its maiden voyage.
Cameron released a statement saying: 'There's a whole generation that's never seen Titanic as it was meant to be seen, on the big screen.
'And this will be Titanic as you've never seen it before, digitally re-mastered at 4K and painstakingly converted to 3D.
'With the emotional power intact and the images more powerful than ever, this will be an epic experience for fans and newcomers alike.'