The invention discloses a three-phase load unbalance regulating method for regulating load one level by one level, and relates to the improvement technology of the power supply quality at the area transformer substation, and specifically relates to the method for adjusting three-phase load unbalance by upwardly regulating the load one level by one level beginning from the tail the power supply line. A TTU establishes communication connection with the load through wireless or wire, and the method is characterized by comprising the following steps: step one, the TTU acquires a grid topology structure under a transformer; step two, a tree structure chart is established according to the grid topology structure, wherein a root node is the transformer, a branch node is a branch box, and a leaf is the node; and step three, the TTU regulates the three-phase unbalance of the load under the node at fixed time beginning from the lowest branch node of the tree structure chart, and upwardly adjustsone level by level till to the root node. By adopting the regulating method disclosed by the invention, from the tail of the power supply line to the root of the transformer, the current balance of the three-phase load of all branch lines in the power distribution transformer area is regulated one level by one level, thereby realizing the three-phase load current balance of a main loop at the low-voltage side of the power distribution transformer.