The invention discloses a 3-35 kilovolt grading compensation type automatic voltage adjusting device and relates to the technical field of voltage compensation. The 3-35 kilovolt grading compensation type automatic voltage adjusting device comprises a compensator transformer, a low voltage contactor set, a measuring feedback control device, and a same-phase measuring supply power supply transformer. A secondary compensation winding of the compensator transformer is connected in series with a phase wire circuit of a high voltage power distribution network. The 3-35 kilovolt grading compensation type automatic voltage adjusting device is characterized in that the same-phase measuring supply power supply transformer comprises a primary winding connected to a three-phase line of the high-voltage power distribution network and two secondary windings which are respectively connected to the low voltage contactor set and are used for measuring, the compensator transformer comprises two completely-same primary windings connected to the low voltage contactor set and the secondary compensation winding connected in series in the circuit of the high voltage power distribution network. The 3-35 kilovolt grading compensation type automatic voltage adjusting device has the advantages that the whole device is small in size, light in weight, and free of carbon brushes, servo motors, and mechanical transmission and the like, has remarkable energy-saving effect, and can automatically and stably output voltage on the condition that nobody is on duty.