ABSTRACT Photocatalytic H 2 O 2 generation is hindered by low concentrations and energy‐intensive purification, posing major barriers to practical application. Herein, a tandem catalytic strategy that integrates H 2 O 2 generation with its in situ utilization in organic synthesis is reported to overcome these constraints. Covalent organic frameworks (COFs) engineered through a “docking and locking” strategy provide an ideal platform for enabling such tandem transformations. The optimized TTPh–OH