The paper presents an experimental analysis of the chemical recycling of end-of-life waste composites i.e., waste wind turbine blades (WTB). Chemical recycling of both glass fiber and epoxy resin monomers was performed through the solvolysis process of the WTB, carried out at a temperature of 100-190°C, at 1 to 3 hours process time, and pressure 30-60 bar, at a Parr 4650 batch reactor with a capacity of 500 ml at inert N2 atmosphere. The solvolysis process was carried out according to the experimental plan developed using the design of the experiments (DOE) method. To the WTB sample, a mixture of selected solvents together with various amounts of triazabicyclodecene (TBD) was added, to provide the bicyclic strong guanidine base. Additionally, the catalytic impact of TBD addition (0.015 and 0.025 mol) on the recycling efficiency of the waste turbine blades was studied and discussed. After the process, the liquid product was separated from the solid residues by filtration under reduced pressure for further nuclear magnetic resonance (NMR) analysis. The solid residues were washed with isopropanol and then dried. The results show that the conditions of the chemical recycling of end-of-life wind WTB have prominent, but not the only statistically significant impact on the recovery efficiency of glass fibers and monomers used in epoxy resins, such as bisphenol-A. It was also observed that the composition and type of WTB have an impact on the final efficiency of the investigated process. In the study, the resin removal efficiency of the composite material was determined in conjunction with the determination of the optimal process conditions. The resin removal efficiency of the tested process is greater than 30% in 2 hours at 190 °C. Moreover, the possibility of using a liquid fraction of the WTB solvolysis products for the synthesis of sustainable low molecular weight epoxy resin has been successfully evaluated.