Britain's biggest cinema operator, Odeon, say they've sold over 400,000 tickets - the most advance bookings they have ever received.
Beaten own record
That's twice the number sold since last week which was already a record.
The film, which stars 12-year-old Daniel Radcliffe, has been tipped to be one of the biggest films of all time.
Fans and celebrities lucky enough to attend last Sunday's star-studded premiere in Leicester Square gave the movie a thumbs up.
There are preview screenings at some cinemas this weekend and the film goes on general release next Friday.