The Brazilian arrived on Tyneside from Hoffenheim in 2019 and has made 179 appearances for Newcastle, scoring 25 goals.
Joelinton was part of the Newcastle side who reached the Carabao Cup final last season and earned qualification for the Champions League for the first time in two decades.
He has not featured for the Magpies since their FA Cup victory against rivals Sunderland earlier this year in January due to injury and has subsequently undergone thigh surgery.
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Speaking about his new contract, Joelinton told the club website: “I feel great. I feel very happy and my family is happy.
“A lot of things have happened in my years here. I’ve learnt a lot and grown a lot, and for me to come here to Newcastle was the best decision of my career.
“I love playing for the club. I love the club, I love the fans.
“We had a lot of discussions and I always wanted to be here. I’m glad to continue and I hope to have success in the years to come.”
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Newcastle boss Eddie Howe said: “This has been a big priority for us off the pitch and I’m absolutely delighted Joelinton has committed his future to the club.
“Joey is an exceptional player and person, and the love he has for the club is reciprocated by all of us here. He brings unique qualities to the group and undoubtedly makes us stronger.”
