System of disposable moulds for the realization of modular formworks for vertical concrete castings, comprising a basic element which is shaped as the side surface of a parallelepiped comprising two side coupling faces (7a, 7b), opposite to each other, used to mate the side surfaces of other equal moulds, and two outer side faces (4a, 4b), opposite to each other, used to make-up the outer faces of the formwork, said basic element comprising upper means and lower means for the vertical connection to other moulds and one or several openings on the side coupling faces (7a, 7b), so as to let the cement mixture freely flow toward the disposable moulds beneath and adjacent thereto, said basic element comprising, on the outer side faces (4a, 4b), a plurality of openings designed to let a limited quantity of cement mixture comes out during the filling casting; said system of disposable moulds being characterized in that: - comprises a plurality of types of disposable moulds of different shapes, all of these being modular and designed to be assembled each other, every type of disposable mould corresponding to a well defined function, said plurality of disposable moulds comprising, further to the basic element, the following types of special elements: - a mould with a built-in housing for accommodating electrical devices; - a right mould to realize an intersection with a partition; - a left mould to realize an intersection with a partition; and - a mould shaped to accommodate a covering rafter or similar devices, such mould corresponding to the basic element modified with the addition of two spaces for receiving the covering rafter; wherein each of said special elements is shaped as the side surface of a parallelepiped comprising two side coupling faces (7a, 7b), opposite to each other, and two outer side faces (4a, 4b), opposite to each other, used to make-up the outer faces of the formwork, each of said special elements comprising upper means and lower means for the vertical connection to other moulds and one or several openings on the side coupling faces (7a, 7b), so as to let the cement mixture freely flow toward the disposable moulds beneath and adjacent thereto, each of said special elements comprising, on the outer side faces (4a, 4b), a plurality of openings designed to let a limited quantity of cement mixture comes out during the filling casting; wherein said right and left moulds to realize an intersection with a partition feature a third coupling face on the right and left side, respectively; wherein said upper means of said special elements for the vertical connection of the mould to other moulds consist of a foil, forming an extension upwards of the outer faces of the side surface of the mould, projecting from the outer upper perimeter and suitable for making-up an upper female half-joint; wherein said lower means of the special elements for the vertical connection of the mould to other moulds consist of a foil, forming an extension downwards of the inner faces of the side surface of the mould, projecting in a slightly internal position with respect to the external perimeter, so as to make-up a lower male half-joint suitable for mating the said upper female half-joint; wherein said foil making-up the lower male half-joint of said basic and special elements is specularly cut in the sections parallel to the outer side faces (4a and 4b), so as to receive the foil of an upper female joint projecting from the coupling faces of other moulds beneath and allow to connect beneath to two portions of other two moulds, thus allowing the staggered mounting of the moulds or the realization of intersections between walls; wherein each of said basic and special elements is a molded element made of plastic material, featuring a substantially flat shape, comprising the different faces of the side surface of the element connected to each other by laminar hinges; wherein along two terminal edges of the molded element which will assume a vertical position after assembling the mould, locking-in facilities are arranged, which allow to join the first and the last face to each other, so as to form a straight angle and thus close the mould; wherein the outer side faces of each of said basic and special elements include stiffening ribs on both sides. - comprises a plurality of types of disposable moulds of different shapes, all of these being modular and designed to be assembled each other, every type of disposable mould corresponding to a well defined function, said plurality of disposable moulds comprising, further to the basic element, the following types of special elements: - a mould with a built-in housing for accommodating electrical devices; - a right mould to realize an intersection with a partition; - a left mould to realize an intersection with a partition; and - a mould shaped to accommodate a covering rafter or similar devices, such mould corresponding to the basic element modified with the addition of two spaces for receiving the covering rafter;