Introducing the significance and purpose of laser automatic frequency locking, expounds the algorithm of laser automatic frequency locking and common optical frequency references, analyzes the differences and advantages and disadvantages of different algorithms and frequency references, discusses the problems and methods to solve in the field of laser automatic frequency locking, and obtains the development direction and improvement trend of the current laser automatic frequency locking field. The areas to be strengthened are pointed out, and some difficulties to be solved are put forward, which provides a reference for the subsequent research on automatic frequency locking of lasers.