Sims's memoirs will cover the reality TV star's "surprising lows" and "amazing highs" and is scheduled for release in November.
Talking about her book, Sims said: "My book will reveal the truth about my life for the first time. There have been surprising lows in my life as well as amazing highs and everything I have written comes from the heart."
Editor Sara Cywinski said: "We couldn't be more excited about working on this book. We are all huge fans of TOWIE, but there is more to Chloe than the girl we see on the show and I know fans will be surprised by just how much Chloe reveals about herself.
"The book is written with journalist Alice Walker. It's a gripping, honest read from start to finish, and I can't wait for the book's release. From her sometimes painful childhood to her first big romance, the plastic surgery that has often grabbed headlines to the truth about being a single mum, this will be one of the most compelling celebrity autobiographies of the year."
The book is being released by John Blake Publishing.
Fans can pre-order the autobiography from Amazon.