The utility model relates to a low-voltage power supply three-phase load imbalance automatic adjusting system. The system is characterized by comprising an adjusting system host, a plurality of load horizontal acquisition devices and contactors. The adjusting system host is connected with the load horizontal acquisition devices. The adjusting system host is further connected with the contactors arranged between a low-voltage distribution transformer and each controllable single-phase load for performing opening and closing control on the contactors. A distribution transformer three-phase load automatic balancing function is thus achieved. The system with a reasonable design is simple and easily achievable. Various technical schemes are offered for selection. Automatic treatment of three-phase load imbalance in low-voltage power supply regions is achieved. The effects are apparent. The low-voltage power supply electric energy qualities and the service efficiency are improved. The low-voltage power supply three-phase load imbalance automatic adjusting system which has obvious technical and economic edges is especially suitably used in regions having a large number of controllable single-phase loads with low requirements for power supply continuity.