In order to accurately restore the single pulse laser paint removal process, a finite element model for single pulse laser paint removal was established and the temperature field and thermal stress field of laser paint removal were analyzed. The simulation and restoration of the paint layer morphology were realized through the birth and death unit technology, and the comparative verification of different power laser experiments was completed. The results show that the maximum ablation depth is determined by the temperature criterion, and the maximum ablation width is determined by the thermal stress criterion. The average fitting degree between the paint removal morphology obtained by the multi physical field analysis model and the test is 93.3%, which is 6.5% higher than that of traditional single temperature criterion. This research has good guidance and application value for the actual laser paint removal process.