The utility model relates to a portable decontamination plant of nuclear power station modular, include independent setting's power module and purification module each other, power module is including the pump machine that provides the power supply, the import and the export of pump machine are connected with inlet tube and outlet pipe respectively, it includes the filter to purify the module, inlet tube and outlet pipe are connected respectively in the import and the export of filter, portable decontamination plant includes still that independent setting's chemistry adds medicine module and independent setting's resin switching module, resin switching module includes the duolite jar, inlet tube and outlet pipe are connected respectively in the import and the export of duolite jar. The utility model discloses a decontamination plant pass through modular structure design realize portable, can the online cleaning pipeline or the equipment of portability not, the radioactive water who reduces them is flat.