The present invention relates to an automatic arc voltage switching system, and more particularly, to an arc voltage automatic switching system that automatically switches voltages by using a gas pressure of a gas supply device, which is a conventional voltage switching. In the embodiment of the present invention by sensing the air pressure increases in the pneumatic line to operate the relay of the transformer control circuit 30 to switch the voltage, even if the operator does not have to switch the terminal to the jumper wire, simply by operating the switch (SV63) In order to provide an automatic arc voltage switching device that has only an effect capable of efficient and convenient operation of semiconductor manufacturing equipment by changing the above, this effect of the present invention can be widely used in semiconductor manufacturing equipment using arc discharge.
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