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The systematic alteration of a carbon nitride unit (CNU) for visible light photocatalytic water splitting is a promising research subject owing to the increasingly serious energy and environmental complications. Herein, the conjugated monomer 3,6‐dibromopyridazine (DBP) is integrated within polymeric carbon nitride (PCN named as CNU = carbon nitride containing urea precursor) via thermal condensation, which is designated as CNU‐DBP. These samples are used for the first time in the photocatalytic conversion of CO₂ reduction and hydrogen (H₂) evolution through water splitting. Such integration intimidates the electron density, promoting charge transfer separation and elevating the photocatalytic activity of CNU under visible light illumination. The superior sample such as CNU‐DBP_9.0 after 4 h of photooxidation generates 65.7 μmol of CO and 17.3 μmol of H₂ of the reaction system, emphasizing the …