The utility model relates to a signal triggering technology, in particular to a multi-path synchronous triggering device, which comprises a signal source and an electro-optical conversion circuit, wherein the electro-optical conversion circuit is used for carrying out electro-optical conversion on the signal source, optical triggering signals converted through the electro-optical conversion circuit are input into an optical divider, and multi-path optical signals output by the optical divider after the optical division respectively trigger a plurality of instruments. The multi-path optical signals output by the optical divider after the optical division respectively trigger the instruments, the synchronous performance of the corresponding multi-path optical signals is good, the optical divider is adopted, only one electro-optical conversion device is needed, a circuit for shaping and amplifying input electric signals is omitted, the circuit is greatly simplified, the inherent time delay is little, and the performance is stable.