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PET rigid closed-cell foam is widely used as a sandwich material in wind turbine blades, in order to further improve the large-scale utilization of retired blades and realize the green and sustainable development of wind turbine blade materials, the effective utilization of PET materials has attracted increasing attention. In this paper, the dynamic rheological properties of PET foam recycled powder (Re-fPET) were studied by rotational rheometer, and the composite viscosity of Re-fPET recycled material was sensitive to temperature, showing obvious shear thinning behavior, and the composite viscosity decreased more obviously above 270 °C. The zero shear viscosity η0 was obtained by extrapolation by the Cross method, the activation energy of viscosity was further calculated according to Arrhenius, and the ΔEη0 was 241.29 kJ/mol, which had a significant effect on the untangling of the segments. The rheological characteristics of Re-fPET recycled powder were studied using a torque rheometer. The torque value of Re-fPET resin decreased rapidly and the equilibrium time was shorter above 270 °C. The torque value after equilibrium was smaller, the melt characteristic viscosity decreased significantly, and the material was significantly degraded, which was not conducive to processing. [ABSTRACT FROM AUTHOR]