The invention discloses a spliced carriage plate structure, and belongs to the technical field of vehicle components. The spliced carriage plate structure comprises a plate body; one side edge along the length direction of the plate body is provided with an embedding foot, and the other side along the length direction extends to form a positioning mechanism which can be embedded with an embeddingfoot of an adjacent plate body and can be fixed with a vehicle. The spliced carriage plate structure has the advantages that: the embedding foot on the plate body is only embedded with a positioning mechanism of the adjacent plate body, so the assembly is quick and convenient; the structure is convenient to manufacture due to a simple structure; because a hollow two-layer structure is not required, materials are obviously saved; and because a hollow structure is eliminated, the spliced carriage plate structure has high rigidity and is favorable for resisting impact in the using process.