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The star said she hopes to give “love, encouragement and support” by opening up about raising her son, who was born with multiple disabilities including partial blindness, Prader-Willi syndrome and autism.
Watch: Katie Price vows to get justice after man cleared over offensive video mocking disabled son Harvey
Price wrote on Instagram: “Life with Harvey has been a rollercoaster of emotions - from the day I held Harvey in my arms to this day I cannot begin to express the wonders of our incredible journey together.
“A mother son bond that goes beyond the everyday ‘normal’.”
Pre-order it: Katie Price: Harvey and Me | £20 from Amazon
The star said the 19-year-old is “one in 500 million” and that she feels “blessed to have him in my life”.
“Sharing our story I hope to bring love, encouragement and support,” said the mother-of-five.
“I want to educate parents and others, with a few good belly laughs, by giving an insight into what my world with Harvey is like behind closed doors.
“I’ll take you away from showbiz thrills and spills and into my home, into my life as a parent with a child of complex needs and disabilities.”
Price, 43, said Harvey had taught her to be a “better person, mother and to fight for what is right, for those especially who have until now not had a voice to be heard”.
The star had Harvey with former flame Dwight Yorke.
She has previously opened up about the challenges of raising Harvey and earlier this year told how she made the decision to put him into care at a residential college after reaching “crisis point”.
Price is also mum to son Junior, 15 and daughter Princess, 13, from her former relationship with Peter Andre, and son Jett seven, and daughter Bunny, six, with her ex Kieran Hayler.
Harvey And Me will be on sale on 26 October.
Watch: Katie Price undergoing fertility treatment