Abstract: The Optical Phase-Locked Loop （OPLL） is a highly effective technique for generating high-quality coherent light, and it has been widely applied in precision measurement systems based on atom interferometry. Its operation relies on a phase-locked electronic feedback circuit to actively stabilize the frequency and phase of an optical signal, producing a highly stable and phase-coherent laser output. This approach offers several key advantages, including a wide frequency offset tuning range, low phase noise, absence of sideband interference common in modulation-based methods, and an easy spatial separation of coherent beams. Sensors utilizing OPLL technology demonstrate superior performance in atom interferometry compared with those using alternative methods like Acousto-Optic Modulators （AOMs） or Electro-Optic Modulators （EOMs）. The enhanced phase stability and spectral purity directly contribute to lower measurement noise and higher sensitivity, which are critical for advanced applications in inertial sensing and gravimetry. This paper first introduces the fundamental principles and optical configurations of OPLL systems. It then provides a comprehensive review and a critical evaluation of the current state-of-the-art OPLL technologies employed in atom interferometry, with coverage of both domestic and international developments. The discussion includes an analysis of the technical approaches adopted to address key implementation challenges. Looking forward, to meet the demanding requirements of next-generation atom interferometric precision measurements—which require greater robustness, miniaturization, and scalability—this work identifies three major development trends. These are the deep integration with digital signal processing for enhanced control and performance, the pursuit of system-level integration and modularization for improved reliability, and the pioneering effort towards chip-scale implementation based on Photonic Integrated Circuits （PICs）. This systematic analysis provides a solid foundation for advancing the overall capability of future OPLL systems, which thereby facilitates the development of high-precision atom interferometry sensors, enabling their broader deployment in fundamental physics research, autonomous inertial navigation, and space exploration.