The present invention relates to a shunt reactor capable of adjusting the capacity and an AC voltage control device using the same, and more particularly, a capacitance is generated between an AC underground power distribution cable and an earth ground, which is embedded in the earth and transmits an AC voltage. When the charging current is generated and the AC voltage transmitted increases, the shunt reactor controlling the magnitude of the AC voltage transmitted by adjusting the capacity of the coil according to the load capacity of the AC underground distribution cable, and the AC voltage control device using the same will be.;The shunt reactor capable of adjusting the capacity according to the present invention is connected to an AC underground distribution cable embedded in the ground, and in the shunt reactor controlling the magnitude of the AC voltage transmitted by the AC underground distribution cable, one side is grounded. Reactor coil is composed of a coil, the coil is provided with a branch tap for each predetermined number of turns; And a branch tap switching unit connected between the AC underground distribution cable and the reactor coil to selectively connect each branch tap installed in the AC underground distribution cable and the reactor coil. It is characterized in that it has a function of suppressing and / or absorbing arc current that may occur at the time.;Shunt reactor, branch tap, switching, ground charge current, load, surge, power factor, capacity control, voltage control
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