The invention provides a sampling value signal time synchronous detection method based on alternating current analog-to-digital conversion real-time response, which is a method for detecting a time deviation of an alternating current time synchronous sampling value output moment of alternating current signal analog-to-digital conversion equipment according to real-time response characteristics ofan alternating current analog quantity and a communication physical layer alternating current sampling value digital signal by combining a time synchronous signal. According to the detection method provided by the invention, based on a physical relationship among time synchronous signal input, alternating current signal input, communication physical layer digital signal output and the like, by alternating current sampling value information carried in the digital signal, the time deviation of the alternating current time synchronous sampling value signal output moment is measured, and physicalconsistency of an alternating current sampling behavior of the alternating current signal analog-to-digital conversion equipment and the time synchronous signal can be determined. The sampling value signal time synchronous detection method disclosed by the invention accords with a values transfer principle, has the physical display characteristic, is beneficial to alternating current sampling datasharing technical application and standard development thereof and is beneficial for further improving wide-area real-time monitoring and intelligent capacity of a power system and promoting social application of novel alternating current measurement equipment.