The centralized disposal of biomass in agricultural parks has advantages such as convenience, economy and flexibility of scale. Biomass power generation is the core of the energy systemin agricultural park, but excess power capacity or seasonal changes will lead to wasted resources. Based on the analysis of the research on biomass pyrolysis for biochar and the shortcomings of by-product treatment, it is proposed that biomass combustion for power generation, combustion for heat supply and biomass pyrolysis for biochar should be coupled with agriculture and energy system to form a biomass energy co-generation system. The biomass combustion for power generation can supply power for power grid, agricultural facilities and users. The biomass combustion for heat supply can ensure the heating demand of agricultural facilities and temperature greenhouses in winter. The biomass pyrolysis for biochar can ensure demands of the biomass growth and environmental governance in the agricultural parks. This system is conducive to improve the construction of energy Internet in agricultural parks and realize the aim of“carbon neutral”.