Combination sofa convenient to disassemble and assemble and seat frame

The invention discloses a combined sofa convenient to disassemble and assemble and a seat frame. The combined sofa comprises the seat frame and a backrest, the bottom of the backrest is located on the outer side of the rear side vertical plate and provided with a hook matched with the rear side vertical plate, the hook is provided with a groove which is matched with the rear side vertical plate in thickness and provided with a downward opening, and the groove is connected to the top of the rear side vertical plate in a clamped mode. Or the sofa comprises at least two sofa seat frames, seat frame top buckles and seat frame bottom connecting pieces, at least one group of corresponding side face vertical plates which are clung to each other is arranged between the two sofa seat frames, the top parts of the corresponding side face vertical plates are provided with the seat frame top buckles, and the bottoms of the corresponding side face vertical plates are provided with the seat frame bottom connecting pieces. A