This study presents a continuous and low-carbon production method for flash graphene (FG) from biomass. The researchers developed an integrated automatic system with energy-efficient allocation to achieve continuous FG production with significantly reduced carbon footprint. The system uses a programmable logic controller to coordinate modular components, enabling the turnover of biomass FG production. A pyrolysis-FJH nexus was proposed, where pyrolysis is first used to release biomass pyrolytic volatiles, followed by FJH reaction to optimize FG structure. Biochar with appropriate resistance self-suffices to initiate the FJH reaction, resulting in a low carbon emission of 1.9 g CO₂-eq g⁻¹ graphene, a reduction of up to 86.1% compared to traditional biomass-based FG production. The system also addresses the high carbon footprint caused by excessive energy use in AC-FJH and carbon black utilization. The integrated device significantly improves production rate, with a sample tray of 16 samples produced in -8 min with a high yield of 21.6 g h⁻¹. The system enables the production of high-purity FG with few-layer structures, demonstrating excellent dispersibility, catalytic, and photothermal properties. The study also evaluates various production pathways, showing that biochar-involved FG production has significantly lower carbon emissions. The continuous production of FG at pilot scale is feasible, with biomass such as sawdust and bamboo producing high-purity FG with low carbon emissions. The study highlights the potential of the pyrolysis-FJH nexus for sustainable FG production, offering a promising solution for large-scale applications. The results demonstrate that the integrated system can achieve low-carbon, continuous FG production, with significant environmental and economic benefits.This study presents a continuous and low-carbon production method for flash graphene (FG) from biomass. The researchers developed an integrated automatic system with energy-efficient allocation to achieve continuous FG production with significantly reduced carbon footprint. The system uses a programmable logic controller to coordinate modular components, enabling the turnover of biomass FG production. A pyrolysis-FJH nexus was proposed, where pyrolysis is first used to release biomass pyrolytic volatiles, followed by FJH reaction to optimize FG structure. Biochar with appropriate resistance self-suffices to initiate the FJH reaction, resulting in a low carbon emission of 1.9 g CO₂-eq g⁻¹ graphene, a reduction of up to 86.1% compared to traditional biomass-based FG production. The system also addresses the high carbon footprint caused by excessive energy use in AC-FJH and carbon black utilization. The integrated device significantly improves production rate, with a sample tray of 16 samples produced in -8 min with a high yield of 21.6 g h⁻¹. The system enables the production of high-purity FG with few-layer structures, demonstrating excellent dispersibility, catalytic, and photothermal properties. The study also evaluates various production pathways, showing that biochar-involved FG production has significantly lower carbon emissions. The continuous production of FG at pilot scale is feasible, with biomass such as sawdust and bamboo producing high-purity FG with low carbon emissions. The study highlights the potential of the pyrolysis-FJH nexus for sustainable FG production, offering a promising solution for large-scale applications. The results demonstrate that the integrated system can achieve low-carbon, continuous FG production, with significant environmental and economic benefits.