Zero line live-line fault warning device

The invention discloses a zero line live-line fault warning device, and the device comprises an input step-down module which is used for collecting the real-time voltage of a zero line, and carrying out the step-down of the real-time voltage, so as to generate a step-down alternating current; a rectification module which is connected with the input voltage reduction module and is used for converting the voltage reduction alternating current into direct current; and a light-emitting module which is connected with the rectification module and is used for emitting light when the voltage value ofthe direct current is greater than or equal to a preset light-emitting threshold value. According to the warning device, the situation that a zero line strip fault can be found by relying on user fault reporting for a long time is changed, original passive fault finding is changed into active fault finding, and active defect elimination can be achieved. Moreover, the warning device is simple in circuit structure, can be p