The tomb has five mummies inside but no-one knows who they are yet. Could they be the famous Queen Nefertiti and her daughters?
Nefertiti was Tutankhamun's mother-in-law. She ruled Egypt between 1379 and 1358 BC and her tomb has never been found.
Some archaeologists are wondering whether her mummy might be inside this mystery tomb. They're going to do lots of tests to find out more.
The mummy in the picture above is called Takabuti and is on show in Northern Ireland at the Ulster Museum.