Solar integrated energy systems are gradually becoming an important solution for residential district energy supply, yet spatial constraints pose significant challenges to the deployment of solar equipment. An integrated energy system for full-spectrum solar energy utilization coupled with hydrogen blending technology is proposed in this paper. Specifically, the system employs photovoltaic cells to convert high-energy spectrum of sunlight into electricity, while low-energy spectrum is directed to solar collectors for heat generation, thereby achieving multi-tiered and refined solar energy exploitation. Meanwhile, in order to extend the hydrogen utilization scenario, a hydrogen blending equipment operation strategy is introduced, offering hydrogen-mixed natural gas as a hybrid energy source for gas equipment. Finally, the optimal capacity configuration of the system is solved by the honey badger algorithm. The simulation results show that the solar spectrum beam splitting technology effectively improves the solar energy utilization of the system, thus reducing the footprint of the solar energy equipment. Furthermore, hydrogen blending technology and its operational strategy effectively reduce system operational carbon emissions, prevent over-allocation of hydrogen energy equipment, and strongly support the development of an efficient, clean, and flexible energy supply system.