Photocatalytic oxygen reduction provides a sustainable approach for hydrogen peroxide (H₂O₂) synthesis, but the charge carrier-based pathway is severely limited by inefficient charge separation and redox decomposition of the produced H₂O₂. Energy transfer photocatalysis (EnTP) is an alternative charge-carrier-free route for H₂O₂ synthesis. Herein, we propose a strategy of killing two birds with one stone to simultaneously realize the synthesis of H₂O₂ and conversion of a biomass derivative by coupling EnTP with the Achmatowicz reaction. Results show efficient production of H₂O₂ at a rate of 14.6 mmol g_cat⁻¹ h⁻¹ and an apparent quantum yield (AQY) of 44.1% at 420 nm, coupled with the conversion of biomass-derived furfuryl alcohol (FFA) into hydroxy-2H-pyran-3(6H)-one with a high selectivity of 85.9%. Such a performance was attributed to the efficient EnTP over the amide-functionalized heptazine framework photocatalyst for singlet oxygen generation, which induces the FFA conversion and concurrently produces H₂O₂. A systematic study of the photoexcitation process of the catalysts reveals that the amide functionalization significantly improves the intersystem crossing (ISC) efficiency, as the structural modification optimizes the electronic structure and thus tunes the composition and distribution of energy bands.