The transparency of low-voltage substation areas is of great significance for comprehensively improving the service quality, management level, and consumption capacity of low-voltage distribution systems, and is the only way to build a new type of low-voltage distribution network under the "dual carbon" strategy. Firstly, the core connotation and current development status of transparency in low-voltage substations are elaborated. Secondly, relevant research on the transparency of low-voltage substations at home and abroad has been reviewed. Furthermore, the key tasks of low-voltage substation transparency are proposed in five aspects: perception, measurement, communication, platform, and security, and the main contents of each key task are elaborated. Then the key technologies and future development directions of low-voltage substation transparency that need to be focused on at this stage are pointed out. Finally, transparency technology in low-voltage substation areas are prospected.