A multi-place control single live wire switch comprises a single live wire unit, a maintaining unit, an anti-interference unit and a multi-place switching unit. An illuminating lamp or other electrical equipment can be controlled at infinitely many places. The single live wire switch allows normal operation pulse signals with the width larger than a specified value to pass, positive narrow pulses in the negative wide pulse period and negative narrow pulses in the positive wide pulse period are automatically filtered, especially the filtering capacity can be fast restored to filter continuous positive narrow pulse interference signals or negative narrow pulse interference signals, and ascending edge shake or descending edge shake of switching pulses is eliminated. The maximum widths of the positive narrow pulses and the negative narrow pulses needing to be filtered can be adjusted by changing the charging time constant and the discharging time constant. The single live switch can serve as a substitute product for common switches.