Detection method and system for multi-channel alternating current strong current signal

The invention provides a detection method for a multi-channel alternating current strong current signal. The method needs to provide a singlechip microcomputer and more than one alternating current strong current signal detection device. The alternating current strong current signal detection device comprises a voltage dividing circuit, a rectifying circuit and a filter circuit; the alternating current strong current signal passes through the voltage dividing circuit, so that the alternating current strong current signal is stepped down; the alternating current strong current signal which is stepped down is sent to the rectifying circuit to be converted into a direct current signal; the direct current signal is converted into a stable low voltage direct current signal through the filter circuit; the low voltage direct current signals of all the alternating current strong current signal detection devices are received by the singlechip microcomputer, and if the low voltage direct current signals are in low leve