The utility model relates to a commercial power zero -crossing detection treatment circuit, including rectifier bridge DB1, first resistance R1, second resistance R2, third resistance R3, fourth resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, stabilivolt ZD1, optoelectronic coupler U1 and triode Q1, wherein, first resistance R1 and secondresistance R2 concatenate, and third resistance R3 and fourth resistance R4 establish ties, stabilivolt ZD1 and at optoelectronic coupler U1's input to provide stable electric current through the 5thresistance R5 and the 6th resistance R6 current -limiting for optoelectronic coupler, the paraphase of optoelectronic coupler output signal process triode Q1, output and commercial power are with theisopic zero crossing signal of frequency. The utility model discloses simple structure, implement conveniently, through 8 resistance, a rectifier bridge, municipality's electrical isolation is realized to a stabilivolt and a triode, waveform processing, and it is few to have a component, simple structure, debugging advantage such as convenient.