Abstract: With the rapid development of the wind power industry, large quantities of end-of-life wind turbine blades are generated, and their recycling and disposal have become a global environmental challenge. Pyrolysis is regarded as an important technology for recovering glass fibers from end-of-life wind turbine blades. However, the mechanical properties of recovered glass fibers are strongly dependent on the pyrolysis conditions. Therefore, the pyrolysis characteristics of end-of-life wind turbine blades at different temperatures and the evolution of the mechanical properties of recovered glass fibers are investigated. The results show that the decomposition of epoxy resin is promoted with increasing pyrolysis temperature. When the pyrolysis temperature reaches 500 ℃, the epoxy resin in the blades is almost completely decomposed. A further increase in pyrolysis temperature promotes the secondary cracking of oligomers. Meanwhile, high-temperature pyrolysis facilitates the removal of unsaturated structures in pyrolysis char, reduces the char yield and amorphous degree, and consequently shortens the oxidation time. In addition, compared with pyrolysis, oxidative decarbonization exerts a more significant effect on the mechanical properties of recovered glass fibers. These findings provide theoretical support for the pyrolysis-based treatment of end-of-life wind turbine blades and the recovery of high-quality glass fibers.