1 064 nm nanosecond pulse fiber laser is used to study the layered paint removal for semi-submersible platform components, and the influence of different laser process parameters on the layered paint removal effect is explored. The results show that the filling space is of significant effect on the layered paint removal, and there is an optimal match for the paint removal parameters, which can realize the step structure of about 1 cm between the primer, middle coat and top coat, and clear step structures can be cleared from the damaged points as the center, the substrate is of no ablation or oxidation discoloration after laser cleaning and the surface grade can reach Sa2.5. The surface roughness is about 20 μm before and after laser paint removal. Through the temperature rise detection of laser paint removal process, it is found that the temperature rise of the substrate in the paint removal process is 60℃ to 65 ℃, which means this temperature rise will not change the substrate structure. It is feasible to use laser cleaning in the layered paint removal of the semi-submersible platform. The research provides a practical basis for the application of laser cleaning in the field of marine engineering.