To explore a new winter clean heating method for agriculture in North China, a solar-biomass energy vegetable greenhouse cross-seasonal heating system was constructed by organically combining photovoltaic and solar thermal technologies on the basis of solar cross-seasonal heating. The TRNSYS software was used to establish a cross-seasonal heating model, which was employed to simulate the cross-seasonal heat storage characteristics of the solar-biomass energy coupling system and to explore the influence of each component parameter on the system performance. Finally, an economic comparison was conducted between the solar-biomass energy cross-seasonal heating system and the traditional cross-seasonal heating system. The results show that the solar-biomass energy vegetable greenhouse cross-seasonal heating system has good stability, which can alleviate the problem of soil temperature decline caused by ground-source heat pump heating. During the heating period, the average heating coefficient of the heat pump unit is 32, and the system energy efficiency ratio is 22. The initial investment of the system is 0.106 million yuan, and the annual cost value for 15 years of operation is 6 800 yuan, which is 8 700 yuan and 9 700 yuan lower than that of the solar cross-seasonal heating system and the ground-source heat pump heating system, respectively. The designed heating system integrates PV and solar thermal energy, realizes the integrated energy heating of cross-seasonal heat storage and biomass energy, and has good economy and stability, providing a new idea for the heating form of winter vegetable greenhouses in North China.