26 November 2014 Last updated at 14:28 GMT
The giant tree is 45 metres tall and is actually made of 1,700 smaller trees put together.
The branches are decorated by 48,000 lights!
The organisers of Dortmund's Christmas market say the tree is the largest "real" Christmas tree in the world.
Check out this enormous Christmas tree in the city of Dortmund, Germany.