A variety of wind power blade coatings with micrometer and micro-nano composite microstructure were prepared by using hydroxyl acrylic resin as the base resin，polytetrafluoroethylene micropowder as micro filler，and nano-silica as nano-filler. The effect of coating surface microstructure on the anti-icing performance of the coatings with different contents of polytetrafluoroethylene micropowder and nano-silica was mainly discussed. The results showed that when the content of polytetrafluoroethylene micro powder and nano silica was 40% and 10% respectively，the coating surface exhibited more obvious micro-nano composite structure with the lowest rolling angle and icing force. At the same time，other keyproperties of the coating met the requirements of relevant technical specifications in the windpower industry. With the further increase of nano silica content，nano silica accumulated and stacked at the voids formed by polytetrafluoroethylene micro powder，which changed the sizeand morphology of the micro-nano composite structure. Although the contact angle continuedto increase，the rolling angle and icing force also increased significantly，and the anti-icing performance showed a significant downward trend.