The invention discloses a regional voltage control method in a local dispatching automatic voltage control (AVC) system. The regional voltage control method particularly comprises the following steps: (1) arranging n 110kV child buses in a region, recording the voltage of a 110kV father bus and reactive power Qi of the ith 110kV child bus to a 220kV transformer substation; (2) obtaining upper and lower limits Uimax and Uimin of the voltage of the ith 110kV child bus and the equivalent impedance Xi of the bus to the 220kV transformer substation; (3) calculating the voltage requirements of the ith 110kV child bus to the 110kV father bus; and (4) counting the ratio delta% of the 110kV child buses which meet the condition in the step (3) in the n 110kV child buses, and carrying out control according to the agreed rules. According to the regional voltage control method, the actual operation conditions of the branch with relatively high load and relatively large power supply radius are considered during fine adjustment; the adjusting times of a main transformer can be well reduced; and optimal adjustment of the voltage is achieved within a relatively large range.