Disclosed herein is an AC negative ion and silver ion generator. The AC negative ion generator includes an AC power supply unit, an oscillation unit, a switching unit, a boosting unit, and an output unit. The AC power supply unit supplies an AC voltage required to operate the ion generator. The oscillation unit oscillates and generates an output pulse having a certain frequency when the voltage is supplied by the AC power supply unit. The switching unit performs a switching operation in response to an output frequency of the oscillation unit. The boosting unit boosts an AC voltage having a certain frequency, output through the switching unit, to a high AC voltage required to generate negative ions. The output unit transmits the high voltage to a discharge electrode placed at a negative ion generation unit. Accordingly, the AC negative ion generator can simultaneously generate negative ions and nano-sized silver ions in indoor air, prevent bad influence of the outflow of a high voltage on various electronic parts, convert polluted indoor air into clean, fresh and refreshing air, and perform antimicrobial and disinfecting actions on various airborne microbes, so that a comfortable and fresh indoor environment can always be maintained and the cleanliness of indoor air can be greatly improved, thus improving the metabolism of a human body.