Three-phase AC phase shift voltage regulator adopts imported large-scale integrated circuit design, internal set three-phase phase shift trigger circuit, one-way thyristor, RC resistance and capacitance absorption circuit and power circuit equal to one, can be automatically or manually adjusted to change the voltage on the load, so as to adjust the three-phase output power. That is, under the action of input control, the strong trigger pulse signal which can change the on-angle of three-phase is generated and then the internal thyristor is controlled respectively, so as to realize the non-polar adjustable three-phase load voltage from 0V to the full voltage of the grid.