Trace neptunium separation system

The utility model relates to the technical field of spent fuel post-treatment, in particular to a trace neptunium separation system which comprises an injection pump, an injector is arranged on the injection pump, a sample solution is loaded in the injector, an outlet of the injector is connected with an inlet of an extraction column through a first pipeline, an outlet of the extraction column is connected with a collecting device through a second pipeline, and the collecting device is connected with the sample solution. A collecting valve is arranged on the second pipeline, a plurality of eluting agent inlets and eluent inlets are formed in the first pipeline, and the collecting valve is electrically connected with the controller. According to the neptunium-containing sample analysis device, all the structures are reasonably connected through the first pipeline and the second pipeline, so that the neptunium-containing sample analysis rate is increased; and the controller is adopted for control, so that the a