The invention discloses a corrosion test method for a redox buffered molten salt system. The method comprises: separately detecting a working electrode made of a metal to be tested and a working electrode prepared from an inert metal in a redox buffered molten salt system to obtain two sets of anodic polarization current curves, carrying out mathematical treatment on the data of the anodic polarization current curves through subtracting a polarization current iA of the working electrode made of the inert metal from the polarization current iA of the working electrode made of the metal to be tested to obtain an anodic polarization current iA, corr relates to corrosion, drawing a graph through lgiA, corr as vertical coordinates and polarization potential delta E as horizontal coordinates, carrying out linear fitting on the curve and calculating a corrosion current value icorr of the metal to be tested in the redox buffer molten salt system according to the fitting result. The corrosion test method can simply, fast and accurately test the corrosion resistance of the molten salt system containing a redox buffer ion pair.