The utility model provides an unbalanced load adjusting device and system relates to electric power power supply technical field, the utility model provides an unbalanced load adjusting device is including the public monitor terminal that becomes, three phase current collection system, the automatic commutation device of current transformer and load balancing, the three phase current that divide branch road top is gathered through three phase current collection system, the electric current of user's load end is gathered to the automatic commutation device of magnitude of voltage and load balancing, information such as voltage, it carries out unbalance rate and calculates with the load size to pass to the public monitor terminal of change on and, optimum adjustment strategy in time makes, the commutation action is made to the automatic commutation device of control load balancing, three -phase load current's imbalance degree has been reduced, user's electric energy quality has been guaranteed, realize the high grade of distribution network, safe power supply. Little, the light in weight of each partial volume of unbalanced load adjusting device, simple to operate easy operation in addition. The problem of the time cycle of prior art manual regulation is long, with high costs is solved.