And she said that she hopes he faces legal proceedings.
"He's been held up as an exemplar because he's unfortunately typical of certain men. I'm interested in those people being prosecuted. We have to set a legal precedent.
"When legal precedent is set by people being actually convicted, then other people can benefit from that because those precedents have been set. But me fueling the gossip and accounts? There's enough out there."
"Statutory rape is a crime, the last time I looked.
"I think it's really important that people get tried through the judicial system. It's a really important arm of democracy that we must uphold because it's under threat from a lot of different quarters."
Weinstein has denied all rape and sexual-misconduct allegations, but is being criminally investigated by police in London, Los Angeles and New York.
Blanchett, one of a number of high-profile actresses to support the Time's Up campaign, to fund legal action brought by poorer women, was also asked about her decision to work with Woody Allen - despite his daughter Dylan accusing him of molesting her when she was a child.
Allen has denied all the allegations against him.
She defended the decision, saying she was unaware of the allegations against Allen.
"I had a very productive time working with Woody, and he has written some of the most extraordinary roles for women. But at the time I worked with him I knew absolutely nothing about what was going on, and it came out subsequently," she said.
"Obviously, Dylan Farrow has been living in a world of pain, and if the case has not been properly tried, then it needs to be reopened and go back into court because that's a place where those things get solved.".