A prefabricated wall (100) being modular is described, comprising at least one module (1) comprising at least one sheet layer (2) adapted to mount at least one panel (5) by means of fixing means (6) and a supporting frame (3), which supports said at least one module (1), said supporting frame (3) is a frame delimiting a through opening (30) which mounts said at least one sheet layer (2) which is a plate sheet comprising a multiplicity of through openings (20) and a multiplicity of through slots (25) adapted to be traversed by a fixing mean (6) up to an engagement position of said fixing mean (6) with said at least one sheet layer (2) in order to mount said at least one panel (5).