In this paper, nanosecond pulsed laser-induced 304 stainless steel surface is used to conduct coloring experiments, and the mechanism of nanosecond laser-induced stainless steel surface coloring is analyzed. Firstly, the laser directly processes the surface of stainless steel samples to study the effect of processing area on the coloring uniformity. Small areas are colored at different distances from the center of the mark, and the effect of the distance from the center of the mark on the coloring effect of the sample is explored. Finally, the laser is used for cyclic marking, and the multi-axis CNC platform reciprocates to improve the coloring effect. Results show that the processing area of the sample can affect the coloring effect of the stainless steel surface, and reducing the processing area of the sample can make the color more uniform. With the increase of the distance from the center of the mark, the coloring stability of the surface of the sample becomes worse. By introducing a multi-axis CNC platform to assist laser coloring can effectively improve the stability of stainless steel surface coloring and reduce the color difference value.