"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.