Patrick Roger's creation will be used to raise funds for a television charity event to support research into neuromuscular diseases.
The tree, which is currently towering inside the chocolatier's factory in Sceaux, weighs four tons and according to Mr Roger's is a piece of "architecture".
He said: "To achieve this kind of architecture – because this really is a piece of architecture – we used a sort of cavity inside to make the chocolate solid enough, because there is very strong vertical pressure."
The chocolate Christmas tree will be shown on France's Telethon, a nationwide charity appeal show, and viewers will receive part of the sugary sculpture in exchange for a donation.
Mr Roger's laboratory also features a wide range of other chocolate sculptures, including small Santas, reindeers and other figurines.