<p>g-C₃N₄-based piezo-photocatalysis has emerged as a promising platform that synergistically couples light energy and mechanical energy via the piezoelectric effect, demonstrating considerable potential in energy conversion and environmental remediation. However, pristine g-C₃N₄ suffers from intrinsic limitations, including a weak inherent piezoelectric response, poor response to low-frequency mechanical stimuli, rapid recombination of photogenerated carriers, and insufficient mechanical stability, hindering its practical application. To overcome these challenges, various modification strategies have been developed to synergistically enhance the piezo-photocatalysis performance of g-C₃N₄. This review systematically summarizes recent progress on g-C₃N₄-based piezo-photocatalysis. It begins with a detailed discussion of the crystal structure and optoelectronic properties of g-C₃N₄, incorporating insights from theoretical calculations and <i>in-situ</i> characterizations. Key modification strategies, including heterojunction construction, morphology engineering, and element doping, are subsequently outlined, emphasizing their roles in amplifying internal electric fields and promoting efficient charge separation. Furthermore, the review highlights recent progress in emerging photocatalytic applications of g-C₃N₄-based piezo-photocatalysis, such as H₂ evolution, H₂O₂ generation, degradation of organic pollutants, and CO₂ photoreduction. Despite notable achievements, significant challenges remain in elucidating the underlying mechanisms and overcoming performance bottlenecks. This review aims to provide valuable guidance for the rational design of g-C₃N₄-based piezo-photocatalytic systems and to accelerate their deployment in sustainable energy and environmental technologies.</p>