Abstract: Residual stress is a common problem in the preparation and application of high-strength steel.Three-dimensional characterization of residual stress distribution in steel plate is a necessary mean to reveal the influence of processing technology on residual stress.The crack compliance method (CCM) was used to characterize the residual stress before and after straightening and leveling process, and the influence of straightening and leveling process on residual stress of 620JJ steel plate for mixing tank was analyzed.The results show that after straightening and leveling process, the maximum stress on the top and bottom surfaces along the width of the strip is decreased by 67.97% and 43.70% respectively, and the fluctuation value of elastic strain energy along the width direction of the strip steel is reduced from 245.41 kJ/m² to 102.73 kJ/m², which is reduced by 58.14%.Straightening and leveling process can reduce the overall residual stress level of the high-strength steel, and the use of the straightening process can improve the stagnant zone that occurs in the single-leveling process.