The utility model discloses a flatbed subassembly and system, including two at least first flatbeds, pass the jack, be provided between two adjacent first flatbeds, pass and promote when the jack stretches out and draws back first flatbed removes, arresting gear is provided each on the first flatbed, arresting gear is used for fixing said first flatbed. The utility model provides a flatbed subassembly and system, the accessible is passed stretching out and drawing back of jack and is controlled the removal of the first flatbed in the flatbed subassembly to drive the removal of the second flatbed is connected with the flatbed subassembly, need not the electric locomotive or the winch pulls the purpose that can make the removal of second flatbed, the material resources of can using manpower sparingly, improvement work efficiency in order to reach.