The utility model discloses a synchronous trigger system based on multi -channel measurement signal, the system includes: the initial signal trigger element, hook up, 2 at least measuring instrument,1 at least oscilloscope, storage device, the 1st measuring instrument sets up the initial trigger point at the hook up, the hook up triggers from the inception and lights, and every interval sets up the measuring point no longer than 100 meters, the initial signal trigger element sends the initial triggering signal of multichannel from the initial trigger point of hook up to the hook up, does initial triggering signal pass through simultaneously light conversion module and light electricity conversion module inputs oscilloscope, every measuring point of hook up passes through electrical signal input to the oscilloscope who corresponds that measuring instrument measured the signal of telecommunication, every measuring point except that initial trigger point, oscilloscope is used for receiving the electric signal waveform of initial triggering signal wave form and every measuring point to the record carries out, and with the wave form process that takes notes light conversion module and light the electricity conversion module convey to storage device.