A prefabricated frame, comprising at least one column, at least one main beam connected to the column, at least one secondary beam connected to the main beam, and a floor, wherein the column, the main beam and the secondary beam are all prefabricated members, and the main beam and the secondary beam are both provided with, on respective top portions thereof, exposed reserve reinforcing bars, and reinforcing bars for cast-in-situ parts, wherein the floor is a laminated plate having a prefabricated slab at a lower portion thereof, and the prefabricated slab, the main beam, and the secondary beam are connected together by means of in-situ casting concrete on respective top portions thereof, wherein the column is a prefabricated column having exposed reserve reinforcing bars at a top thereof and a to-be-cast structure at a bottom thereof, the to-be-cast structure being provided therein with reserve connecting bars, which include vertical reinforcing bars and transverse stirrups, wherein the to-be-cast structure is used for connection with a lower building structure, which has exposed reinforcing bars that are located under the column and inserted into the to-be-cast structure, a connection between the column and the lower building structure being achieved by casting in-situ concrete in the to-be-cast structure, characterized in that the exposed reinforcing bars of the lower building structure are overlapped and bundled with the reserve connecting bars of the to-be-cast structure, whereby the vertical reinforcing bars are connected with the exposed reinforcing bars, and fixed therewith by the transverse stirrups, so that the column and the lower building structure are connected with each other through establishing a template outside of the to-be-cast structure and pouring concrete therewith, and wherein the column is recessed inwardly at one or more lower sidewalls thereof to form the to-be-cast structure. wherein the column, the main beam and the secondary beam are all prefabricated members, and the main beam and the secondary beam are both provided with, on respective top portions thereof, exposed reserve reinforcing bars, and reinforcing bars for cast-in-situ parts, wherein the floor is a laminated plate having a prefabricated slab at a lower portion thereof, and the prefabricated slab, the main beam, and the secondary beam are connected together by means of in-situ casting concrete on respective top portions thereof, wherein the column is a prefabricated column having exposed reserve reinforcing bars at a top thereof and a to-be-cast structure at a bottom thereof, the to-be-cast structure being provided therein with reserve connecting bars, which include vertical reinforcing bars and transverse stirrups, wherein the to-be-cast structure is used for connection with a lower building structure, which has exposed reinforcing bars that are located under the column and inserted into the to-be-cast structure, a connection between the column and the lower building structure being achieved by casting in-situ concrete in the to-be-cast structure, characterized in that the exposed reinforcing bars of the lower building structure are overlapped and bundled with the reserve connecting bars of the to-be-cast structure, whereby the vertical reinforcing bars are connected with the exposed reinforcing bars, and fixed therewith by the transverse stirrups, so that the column and the lower building structure are connected with each other through establishing a template outside of the to-be-cast structure and pouring concrete therewith, and wherein the column is recessed inwardly at one or more lower sidewalls thereof to form the to-be-cast structure.