The striker joined Palace two years ago from Sutton United, where he played senior football.
Martin told Palace's website: It’s not something I expected for myself so soon – but it’s happened.
“To be playing at Crystal Palace, in South London… I’m from south, so it means the world to play here. It’s every boy’s dream to be in a position like mine, so I’ll take it with both hands.”
Academy Director Gary Issott added: “Donte joined us at U15 level and has impressed every step of the way. He had a particularly prolific campaign with the U16s last season, and he has adapted quickly to life in the U18s this year, scoring three times in five starts so far.
“A talented forward with an eye for goal, it’s exciting to see how he continues to develop under our coaching team and what he can achieve in the seasons ahead.”