The invention provides a low-voltage transformer area power supply load allocation method and system. The method comprises the steps of obtaining rated load capacity of electric equipment in each low-voltage transformer area; binding the electric equipment with the low-voltage transformer area correspondingly; obtaining the current rated load capacity of each low-voltage transformer area; and configuring the current rated load capacity of the electric equipment as the current rated load capacity of the low-voltage transformer area. In order to realize power distribution of a power grid or a regional power grid, the current rated load of the low-voltage transformer area can be configured according to the rated load of electric equipment of each low-voltage transformer area of the power gridor the regional power grid. Configuration is carried out within a certain time period. And if the rated load capacity is changed, dynamic adjustment is carried out.