The invention discloses a dumper for transporting plate-type ballast beds. The dumper comprises a dumping device, clamping devices, transfer devices, a dumper frame structure, travelling mechanisms and a rotating wheel house. The dumping device is installed at the tail of the dumper frame structure. The multiple clamping devices are arranged on the two sides of the dumper frame structure correspondingly. The transfer devices are arranged under a flat plate of the dumper frame structure. The rotating wheel house is arranged on the front portion of the whole dumper. The dumping device is composed of a bracket, a travelling driving mechanism, a lifting mechanism and a fixture. Thus, according to the dumper for transporting the plate-type ballast beds, temporary transporting tracks do not need to be built, a required matching crane for unloading the plate-type ballast beds is saved, the transporting number of the plate-type ballast beds is increased, and the unloading efficiency of the plate-type ballast beds is improved; an automatic adjusting structure with telescopic arms is adopted, the clamping requirements for different plate-type ballast beds can be met, manual alignment operation is omitted, the efficiency is improved, and meanwhile the labor cost is reduced.