The utility model provides a foundation structure capable of being directly processed on dredger fill. The foundation structure is formed by laying a water seepage material layer, a woven fabric layer and transverse drain boards on the dredger fill in sequence. A plurality of pipes are arranged on the transverse drain boards side by side, and simple sleepers and light rails are arranged on the pipes in sequence to form the foundation structure subjected to primary processing. The foundation structure has the advantages that by means of the foundation structure, longitudinal drain boards with the lengths of about 35 meters can be inserted into the dredger fill at one time, and primary vacuum preloading or joint vacuum preloading is performed. More materials and labors are used when hardstand areas of the foundation structure are formed. However, compared with secondary vacuum preloading and secondary drain board insertion, time, labor and materials can be saved by 30 percent or so, energy consumption and cost can be reduced by30 percent or so, and the foundation structure is friendly to the environment. Therefore, the foundation structure can be widely applied to dredger fill reclamation engineering, port engineering, road engineering, railway engineering, airport engineering and the like.