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Integration by conventional polymerization of different organic monomers with carbon nitride (CN) is a scalding topic and a simple one‐pot process. To change the electronic structure, chemical composition, and photocatalytic activity of CN, we report the deficient quinone ring monomer here. Thermal copolymerization of urea with 2,6‐diaminoantandantquinone (DQ) monomer is an efficient synthesis of a sequence of modified CN photocatalysts. Results show that the optical absorption capacity is improved by modulating the quinone ring in the CN framework, improving its charge transfer and separation of photogenerated electron and holes. The modified CN shows a notable improvement in the photocatalytic activity of overall water splitting, such as hydrogen evolution rate (HER) and oxygen evolution rate (OER). The co‐polymerized CN‐DQ_5.0 displays a remarkable activity of 520.8 μmol/h of H₂ evolution and 6 …