High-precision zero-crossing synchrotimer

A high-precision zero-crossing synchrotimer comprises a filtering coupling circuit, a zero cross detection circuit, a shaping circuit, a voltage conversion circuit and a digital phase shifter, wherein the filtering coupling circuit filters high frequency clutter of input signals, an input end of the zero cross detection circuit is connected with the filtering coupling circuit, an input end of the shaping circuit is connected with the zero cross detection circuit, an input end of the voltage conversion circuit is connected with the shaping circuit, and an input end of the digital phase shifter is connected with the voltage conversion circuit. The high-precision zero-crossing synchrotimer is advantaged by simple structure, small size, low power consumption, high frequency, reliable operation and the like.