The rotor insulation structure of doubly-fed induction generator (DFIG) bears severe electric stress under the impact of variable frequency voltage. Although the coronaresistant polyimide film and its composite materials can increase the life of the rotor insulation structure, the feasibility of applying common insulation materials to the rotor insulation structure needs to be explored under the pressure of cost control. Through the electric field finite element simulation and the sample winding test, it is proved that the single-side glass fabric reinforced mica tape can be used alone or in combination with the polyester film reinforced mica tape. Both insulation structures have good electrical properties and can completely meet the design requirements of the wind turbine rotor insulation structure.