The actress revealed on Twitter that her dad makes her feel unhappy and referred to him as her "ex-father".
She tweeted: "I don't want my ex-father anywhere near me no matter where I am. He is crazy and scares me.
"I don't want Michael Lohan Sr. anywhere near me, no matter where I am. I am in a great place and he only brings negativity in my world."
Lohan is due to start her prison sentence tomorrow.