The utility model discloses a judge device of current conversion station master clock trouble, including main part, failure diagnosis to the time system on a chip, interface slot, net twine interface,net twine, network master clock, control master clock, control wires, current conversion station control module, intelligent control switch, reserve master clock, trouble feedback wire, data flat cable and fault notice module, the main part is inside be equipped with failure diagnosis to the time system on a chip, the main part left side is equipped with the interface slot, be equipped with the net twine interface in the interface slot. This judge device of current conversion station master clock trouble is equipped with main clock detection system, is equipped with reserve master clock simultaneously, in case the main clock detection in the use is out of order, then control scheme inserts new master clock immediately, the use of meeting an urgent need to the fastest solve the problem increases current conversion station job stabilization nature.