Ola-Adebomi leaves Palace on a free transfer having first been part of the junior age groups from the age of eight.
He spent last season on-loan with Beveren
The striker posted to social media: "It’s hard to find the right words to express how much Crystal Palace means to me. From the age of 7, this club has been my home, my family, and my life. I’ve grown up here, both as a player and as a person, and I’m incredibly grateful for every opportunity I’ve had to wear the Palace shirt.
"That’s why it’s with a heavy heart that I’m announcing my departure from the club. I want to thank each and every one of staff for your unwavering support over the years.
"Crystal Palace will always hold a special place in my heart. I’ll be watching and supporting the team, and I wish everyone at the club all the very best for the future. Thank you for everything."