The invention discloses an analysis and processing method for three-phase voltage abnormities of a regional power grid 35 kV system. The regional power grid 35 kV system usually consists of a 220kV power substation and a plurality of 35kV power substations, wherein the conclusion that three-phase voltages of the 35 kV system are abnormal is drawn through a voltage transformer secondary measured value, and the voltage abnormal phenomenon can be caused if arbitrary equipment from a primary power supply end to a voltage transformer secondary measuring and control device fails; a main transformer low-voltage side of a 220kV transformer in the 35 kV system serves as a power supply end, and is connected to a 35kV bus voltage transformer of each power substation through equipment such as a main transformer lead wire, a bus and a circuit; three-phase voltage values of the system is provided through a voltage transformer secondary measuring device, and the three-phase voltage abnormity can be caused if arbitrary equipment from the main transformer low-voltage side of the 220kV transformer to the voltage transformer secondary measuring device fails; and when operating state of the regional power grid 35 kV system changes, the occurrence of the voltage abnormity can be also caused by resonance triggered by variation of electrical parameters of the system.