The emergence of fuel-cell hybrid electric vehicles （FCHEV） has effectively promoted the green and low-carbon transformation of the energy-transportation system. At present, the research on FCHEV mainly focuses on energy management and control strategies, with little attention paid to the assessment of flexibility potential. Therefore, a FCHEV cluster flexibility potential assessment method that takes into account difference of owners′ willingness to charge is proposed. Firstly, an urban transportation network model is established to simulate the travel characteristics of FCHEV, and then a single FCHEV charging model is established; Secondly, the analytic hierarchy process is improved and combined with the entropy weight method to establish a comprehensive evaluation system for vehicle owners′ willingness to charge, and the impact of endowment effects and environmental awareness on electric vehicle owners′ willingness is comprehensively considered to respond. Finally, an FCHEV cluster flexibility potential assessment model is established and solved for the potential evaluation results. The simulation results show that the proposed method can reasonably characterize the differences in vehicle owners′ willingness to charge during the assessment process, and effectively improve the flexibility of the system when the cluster participates in optimization scheduling.