Different effects to the shear bond strength of epoxy adhesive coating in several surface treatment methods were studied in the experiments where mechanical processing, acid pickling, cold parkerizing process and coupling treatment methods were used. According to the experimental data, the relationship curve between the surface roughness and shear bond strength of epoxy adhesive coating was mapped, and a detailed theoretical analysis after comparing the test results was made. The results show that the two methods of cold parkerizing process and coupling treatment can improve the shear bond strength of epoxy adhesive coating significantly.