Treatment method for reducing residual stress on surface of graphite sample

The invention provides a treatment method for reducing residual stress on the surface of a graphite sample. An existing nuclear graphite processing mode generally adopts a cutting mode, damage of processing to the surface of a sample is not considered, so that residual stress on the surface of the sample is large, especially for the nuclear graphite sample, generally, the in-pile size is small, and the damage generated by the processing mode can cause certain influence on a strain result generated by actual irradiation. If the sample is especially small, the error is more obvious; according to the method, the surface residual stress is reduced by changing the cutting mode of subtractive manufacturing and treating the surface of the sample in a graded and multi-time mode by utilizing a grinding machining mode, and in the process of machining the graphite sample in the grinding mode, the surface residual stress is reduced by utilizing graded use of grinding equipment with different mesh numbers in cooperation w