The stone slab was found during excavation work at the Church of the Holy Sepulchre, which is built on the site thought to be where Jesus' tomb was.
The slab is believed to have been hidden under a marble chapel more than 500 years ago in order to stop pilgrims stealing pieces of it.
A window has been carved into the chapel in order to allow visitors to look into the burial cave once the work has been completed.
Archaeologists were allowed into the church for 60 hours last week and found the slab just hours before their time ran out.
Scientific analysis has begun to try and get a better idea of whether Jesus' body really was laid on the slab or not.
The Church was built by the Christian Emperor Constantine in 325 AD before Muslim Caliph al-Hakim destroyed it in 1009.
Crusaders rebuilt the Church before it was gutted by a fire in 1808 and partially restored.
It was then struck by an earthquake in 1927 meaning it required more repairs which are now taking place.