The Woman In Black actor said that he has chosen to avoid looking back at his performances as the iconic wizard.
"I'd cringe so hard my face would fall off," The Mirror quotes him as saying.
Radcliffe also opened up about becoming reliant on alcohol as his time in the role came to an end.
"I was able to do my job and never drank at work," he insisted. "But it was a daily thing leading me down a very, very destructive path."
Radcliffe previously confessed that he found leading a wild lifestyle to be romantic.
> Daniel Radcliffe: 'I'm not best friends with Rupert Grint'
Watch Daniel Radcliffe in a featurette for Harry Potter and the Deathly Hallows - Part 2 below: