Capacitive touch single live wire switch

A capacitive touch single live wire switch comprises a single live wire unit, a holding unit, an anti-interference unit and a touch unit. On-off of a controllable alternating-current switch circuit is controlled through a capacitive touch key to achieve the switching function. The single live wire switch can effectively filter out power frequency interference and interference pulses at the power frequency or above, in other words, normal touch operation pulse signals with the width larger than a specified value are allowed to pass, and positive narrow pulses in the negative wide pulse period and negative narrow pulses in the positive wide pulse period are automatically filtered out; especially, the filter capacity can be rapidly recovered to filter out continuous positive narrow pulse or negative narrow pulse interference signals. The maximum width of the positive narrow pulses needing to be filtered out can be adjusted by changing the driving current of a forward current driver or the forward anti-interference capacitance, and the maximum width of the negative narrow pulses needing to be filtered out can be adjusted by changing the driving current of a reverse current driver or the reverse anti-interference capacitance. The single live wire switch can serve as a substitute product of common switches.