Abstarct: Wind energy is currently one of the main renewable energy sources, receiving considerable attention due to its affordability and renewability. Wind energy converts the mechanical energy generated by the rotation of turbine blades into electrical energy. The blades are a crucial part of the turbine, which makes their strength, weight, and geometric shape very important. Nowadays, turbine blades are made from composite materials to reduce weight. The large dimensions and weight of steel-structured turbine blades, when exposed to varying wind conditions and a wide range of other forces, can lead to fatigue and failure. Another factor contributing to the failure and reduced performance of wind turbines is the vibrations experienced by the blades, which significantly reduce their fatigue life. This research examines the nonlinear vibrations and resonance analysis of wind turbine blades made from composite materials using the first-order shear deformation theory. In this study, the wind turbine blade is modeled as a cantilever rotating beam. Initially, the nonlinear equations are derived using Hamilton's principle. The nonlinear equations with higher-order derivatives are discretized using the Galerkin method, and the behavior of the cantilever beam's vibrations is analyzed using the method of multiple scales. The analysis focuses on the primary and secondary resonances (superharmonic and subharmonic) and investigates the impact of parameters such as thickness, damping, force, and rotational speed on the frequency response for a homogeneous material and four composite materials. The results indicate that changing the mentioned parameters alters the amplitude of the frequency response. Additionally, among the four composite materials studied, boron/aluminum is not a suitable choice for wind turbine blades, while S2 Glass/Epoxy and Kevlar/Epoxy are the most appropriate materials for their construction.