Abstract: A set of assembly units for a prefabricated bag is disclosed. The set of assembly units for a prefabricated bag, according to the present invention, comprises a plurality of main assembly units, wherein each main assembly unit has a polygonal sheet shape having a predetermined area and having an outer surface and an inner surface separated from each other, and is provided with, at each side portion, insertion holes punctured through both sides and connecting pieces extending outwardly, wherein each main assembly unit is connected to adjacent main assembly units so as to be fixed to each other in such a manner that the connecting pieces are inserted through into the insertion holes of the adjacent main assembly units, and wherein a plurality of main assembly units are continuously connected to each other in the vertical direction and the horizontal direction so as to form the bottom surface and side surfaces of the bag such that an accommodating space is formed.