The utility model discloses a thin slice intercrystalline corrosion sample special fixture, including base member made of iron, the groove that sinks that the recessed formation in middle part of the upper surface of base member is used for placing the sample, recessed the formations L in one side shape groove in the groove that sinks, the activity of L shape inslot is equipped with the U -shaped spare that is used for the tight sample of clamp, the screw with L shape groove intercommunication is seted up to the side of base member, install in the screw with screw screw -thread fit's hexagon socket head cap screw, hexagon socket head cap screw's one end and U -shaped spare butt. The utility model provides a thin slice intercrystalline corrosion sample special fixture, through the cooperation of mobilizable U -shaped spare and base member, what can stabilize fixes thin slice intercrystalline corrosion sample at the base member upper surface, is convenient for the grinding machine to the processing of sample, anchor clamps simple structure, operation process convenient and fast is favorable to improving machining efficiency.