The invention discloses a wind turbine blade passivation treatment process, and relates to the technical field of metal surface treatment. The wind turbine blade passivation treatment process comprises the following steps that after wind turbine blades are cleaned, then the solid solution treatment is carried out, and the wind turbine blades subjected to solid solution treatment are obtained through the assivation treatment by using a polyether polyol-based passivation solution. According to the wind turbine blade passivation treatment process, the compactness of passivation films can be remarkably improved, meanwhile, by virtue of the synergistic effects of trichlorocyanamide and urea phosphate, the film forming property is greatly improved, and the infiltration of impurities such as water is effectively prevented.