But despite expectations of the film being the blockbuster this Christmas, Daniel says he has a normal lifestyle:
"I go home every day when I'm filming. So I don't miss anything about the outside world, apart from my friends."
Harry Potter and the Philospher's Stone will be released on 16 November.
Don't miss Newsround on BBC One tonight at 5.25 for the first ever TV interview with Rupert Grint who plays Ron Weasley.
And don't forget, if you miss it, click on CBBC Newsround Online and watch it here.
Then on Tuesday it's Emma Watson who plays Hermione, followed by Daniel Radcliffe on Wednesday!