The invention relates to a transverse beam-free joggling type vehicle bottom plate assembly which comprises edge beams, longitudinal beams and bottom plates. The transverse beam-free joggling type vehicle bottom plate assembly is characterized in that one side or both sides of the bottom plates are provided with joggling groove structures along the length direction; the bottom plates are connected to form a large bottom plate in a joggling groove connecting way along the longitudinal direction of a vehicle body; the edge beams are connected to the end parts of the bottom plates; and the longitudinal beams are arranged under the bottom plates and connected with the bottom plates. The invention is not provided with transverse beams, does not need the welding between the bottom plates and the transverse beams and reduces the welding deformation and the welding stress of the bottom plate assembly, and the strength and the working reliability of the bottom plate assembly are improved, particularly the vehicle bottom plate made of an aluminum magnesium alloy material has more obvious effect; no harmful gas is generated in the assembly process of the bottom plate assembly, thereby being beneficial to environmental protection; the assembly process is simple, the production efficiency is high, and the manufacture cost is reduced.