Abstract: Based on a brief introduction of self-cleaning technology of photovoltaic power station,the inorganic nano super hydrophilic coating and its coating design are expounded. Field test results show that the modified nanoparticles can effectively improve the hydrophilicity of initial nanoparticles and the binding force between the nanoparticles and the substrate interface,and the coating life and decontamination effects are better than those of ordinary nanoparticles combination,which can significantly improve the generating capacity of photovoltaic power stations. And the power generation gain can reach more than 3%,and the coating life can reach 6～10 a.