The utility model relates to a stepping type voltage regulator, which is suitable for voltage regulation technology that the terminal voltage is low since the power supply radius of a power transmission and distribution line is too long. The structure of the stepping type voltage regulator is composed of a three-phase autotransformer, a three-phase on-load tapping switch and an automatic controller, wherein the three-phase autotransformer is connected with the three-phase on-load tapping switch, and the three-phase on-load tapping switch is connected with the automatic controller. The stepping type voltage regulator adopts the three-phase autotransformer structure, can realize on-load automatic voltage regulation within a range of plus or minus 20%, has excellent control performance and communication function, realizes '' four remote'' functions of remote metering, remote signaling, remote regulating and remote controlling, adopts a unique anti-interference measure, ensures the normal operation of the control unit, adopts the three-phase autotransformer composed of a series transformer and a voltage regulating transformer, reduces gear switching voltage, adopts the fully sealed design to prevent air from entering into the voltage regulator, and reduces the degradation speed of the oil, thereby greatly reducing the maintenance cost; and the stepping type voltage regulator has the advantages of small size, large capacity, light weight, low loss, easy installation, significant consumption reducing and energy saving effects, high cost performance and high reliability.