Threshold beam structure for vehicle

The invention discloses a doorsill beam structure for a vehicle, which belongs to the technical field of vehicle production, and comprises a main beam, the main beam comprises a middle connecting part, and a first connecting part and a second connecting part which are fixedly connected to two opposite side surfaces of the middle connecting part respectively; the same side face of the first connecting part and the same side face of the second connecting part are welded to the side wall assembly, the other side face of the first connecting part is fixedly connected with the floor panel, and the side wall assembly and the main beam are jointly connected to form a first buffering cavity. The front apron board and the rear apron board are fixedly connected to the two axial ends of the main beam, the same side faces of the front apron board and the rear apron board are welded to the side wall assembly, and the front apron board and the rear apron board are connected with the side wall assembly to form a second buff