Rolex chief executive Jean-Frederique Dufour has informed colleagues that plants will close for 10 days from 5pm today.
It is hoped they will reopen on March 27.
“We face a very serious situation,” he wrote in a letter to employees today.
The decision was made to protect staff and their families and also to help limit the spread of Coronavirus, the letter, written in French, continues.
Three plants in Geneva, Bienne and Cressier are all affected.