Abstract: To explore the feasibility of multiple utilization of hydrogen energy in residential buildings in the future, the photovoltaic（PV）-fuel cell cogeneration system of households with hydrogen-burning vehicles was taken as the research object, and the system dynamic simulation model was established based on TRNSY software. The load of electricity, hot water and hydrogen in typical households in Haikou area was taken as an example. The system configuration scheme was optimized by analyzing the reliability of different components of the system. The results show that: the number of PV modules increased from 90 to 150, the reliability of the system’s power supply and hydrogen supply could be increased by 2.33% and 26.93%, respectively, the lowest electricity cost was 0.74CNY/kWh, but the energy utilization rate decreased by 34.13%, when 105 PV modules and 8 hydrogen storage tanks were configured, the power supply reliability was 100%, the hydrogen supply reliability was 86.42%, The electricity cost was 0.77 CNY/kWh, and the energy utilization rate was 95.75%. The system was short of about 20.24% of its hydrogen demand in winter due to low irradiation; Fuel cell heating accounted for more than 80% in April to August, and its annual power supply and heating accounted for 19.82% and 57.65%, respectively.