Abstract: A modular and multipurpose covering device for a pool includes a first modular covering tarpaulin forming a tailor-made safety cover made up of first tarpaulin elements which are joined together reversibly by transverse supports. A second modular covering tarpaulin is superimposed with the first tarpaulin and made up of second tarpaulin elements which are joined together reversibly by the same transverse supports. This second covering tarpaulin affords additional functions that can be modified according to the season. The two end transverse supports are coupled to lashing and tensioning mechanism for securing and holding down on ground covering device that is arranged over a pool.