The present invention concerns a prefabricated module (4) for structures and in particular for the construction of walls and/or floor slabs through a dry mechanical connection between the elements also separately produced. The prefabricated module (4) comprises a supporting frame (8), at least one concrete slab (16) and a mesh (20) at least partially submerged in the said slab (16). Module (4) is characterised by the fact to comprise mechanical means of connection (24, 26) that mechanically connect the slab (16) to the supporting frame (8) by means of bushings (44).