After repeatedly turning him down she said he flew into a terrifying fury, telling her on one occasion: "I will kill you, don't think I can't". She wrote that she was embarrassed for not having spoken up during the initial exposé with Ashley Judd (Frida co-star).
She explained that she couldn't handle it when The New York Times first approached her about sharing her story.
'I started crying when they asked and I ended up not doing it, ' she continued. "When it came out, then I was ashamed that I didn't speak up", she expressed.
"I didn't know there was so many women".
Hayek still carries guilt for not coming forward with her story sooner, and says she's "ashamed" for keeping it in for so long. "I was pretending everything was OK, so I had been around Harvey and acting like everything was OK".
The new information follows a bombshell account Hayek shared with the New York Times in December where she outlined how notoriously awful the disgraced film producer treated her during the creation of her beloved project, "Frida", after she refused his advances.
However, as she spoke to Oprah Winfrey for her SuperSoul Conversations podcast on Wednesday, Salma admitted that she had been invited to be part of the first piece, but turned it down. I went, 'Yes, no, yes, no, yes, no.
"[Harvey] told me he wanted to kill me".
More than 75 women have now come forward to accuse the film maker of sexual harassment, abuse and rape - among them Angelina Jolie, Gwyneth Paltrow, Kate Beckinsale and Lupita Nyong'o.
"There is a moment, and I feel like it's human, where I was like, there's no point for me to talk because it just happens to everyone, and then I felt that by itself, it was just my own little drama".
The Frida star told Winfrey, 64, that she decided it was important to speak out because her pain was "so small" compared to other people's. "It's important to take responsibility for the things we do to others, but we must stop apologizing for being attacked and we must move into a place where you can actually have a conversation".
ABC News reached out to Weinstein on Thursday regarding Hayek's comments to Winfrey.
Weinstein denied Hayek's allegations in December, saying in a statement: "All of the sexual allegations as portrayed by Salma are not accurate and others who witnessed the events have a different account of what transpired".
Oprah at the Apollo will air on February 27 at 10 p.m. ET/PT on OWN: Oprah Winfrey Network and will be available via podcast at Oprah's Super Soul Conversations.