The study presents a novel integrated hydrogen energy system that aims to address the challenges of green production and efficient cross-regional delivery. The system utilizes solar-driven biomass gasification and liquid organic hydrogen storage to produce hydrogen efficiently. High-temperature solar thermal energy is harnessed to drive the biomass gasification process, with the resultant syngas used in methanol synthesis and subsequently for power generation in a Brayton-Rankine combined cycle. At the terminal side of hydrogen consumption, mid/low-temperature solar thermochemical technology is employed to decompose methanol and release hydrogen. The system's performance was evaluated using thermodynamic and economic models, with a case study implementing a biomass gasification capacity of 153.0 ktons annually in China. Results indicate high energy and exergy efficiencies, with significant hydrogen and electricity production rates. Importantly, the system allows for the export of gaseous hydrogen and minimizes carbon dissipation into the environment. The research findings suggest that this integrated approach holds promise for efficiently utilizing solar and biomass energy resources, offering a sustainable energy solution.