"It's the best picture I've ever been in," the 67-year-old actor said on "The Sharon Osbourne Show" Monday.
Of the film's writer/director Quentin Tarantino, Carradine said, "He is the absolute best."
Noting he has worked with some of the most well-respected filmmakers in the world, the actor who plays the titular target said Tarantino" "stands on their shoulders."
"He's seen all of their movies, mine, too, and he takes it a step further," Carradine said.
Originally shot as one film, "Kill Bill" was split into two volumes because one would have run too long.
"Volume 2" opens Friday.
Scarlett Johansson steps out with fiance after pregnancy reveal
Susan Sarandon 'very excited' about daughter's pregnancy