Thyristor-level fault detection device of converter valve

The invention belongs to the technical field of high-voltage power transmission, and particularly relates to a thyristor-level fault detection device of a converter valve. The fault detection device comprises a damping circuit detection module, an optical communication detection module, a trigger unit detection module and a direct-current voltage-sharing circuit detection module, various different types of tests can be carried out by adopting the same set of connection relationship, various test processes can be continuously carried out without re-dismounting and re-connecting the detection device each time, and the test efficiency is improved. Therefore, the test efficiency can be improved, the operation cost can be reduced, the switching of the output voltage among the detection modules needing to output the voltage can be realized according to the relay, the conflict caused by different voltage environments required by different test items in the test process is avoided, and the different test items are co