There was a massive, colourful ceremony to mark the start of the building work, with a mixture of traditional Chinese dancers and classic Disney characters like Mickey Mouse, Pluto the dog, and Snow White and the Seven Dwarves.
Millions of tourists flock to China every year, so it's assumed the new Disneyland will be a huge success.
It's only the third Disneyland park to be built outside America - the other two are in France and Japan.
Rare white dolphins
But not everyone's happy about it. The project bosses have reclaimed loads of land from the sea to get enough space to build on.
Environmental campaigners say this has damaged breeding grounds for fish and rare white dolphins.