An environmental-friendly water-based coating with hydrophobic, anti-erosion and anti-icing properties for fiberglass reinforced plastic (FRP) of wind turbine blades was prepared by incorporating TiO2/SiO2/AlN fillers into the waterborne FEVE fluorocarbon resin. The surface functionalization was characterized by transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM), laser scanning confocal microscope (LSCM) and contact angle goniometer. The influence of different pigments and fillers on the hydrophobicity of the composite coating was discussed, and the change of the anti-erosion and anti-icing properties of the composite coating was also analyzed. The results showed that nano-TiO2 was successfully coated with fluoroalkyl silane, resulting in the improved dispersion and hydrophobicity of the nanoparticles. After the modification of micro/nano-fillers, the composite coating has the smooth appearance and good hydrophobic property, the contact angle (CA) is increased to about 140°. Furthermore, the addition of AlN particles can effectively affect the erosion resistance of coatings, and the coating with 4 wt.% AlN has the best performance. In the process of simulating wind-sand (gas-solid) erosion, the modified composite coating has no obvious peeling off, the CA is improved and stabilized above 150°, resulting in a phenomenon of hydrophobicity induced by erosion, which shows excellent anti-erosion performance and mechanical durability. Additionally, during the simulated freezing process, the freezing time of the modified composite coating reached 1601.4 s at –10 ℃, and the ice adhesion force was only 76 kPa, exhibiting excellent ice delay performance and low ice adhesion. Moreover, the modified composite coating also showed good anti-icing performance under lower temperature conditions. The water-based composite coating meets the application requirements of sandstorm and freezing environment, effectively improve the service life of wind turbine blades and reduce the maintenance cost, which provides a certain feasibility study for the development of a new type of wind turbine blades protective coating.