The invention provides an extra / ultra-high voltage (E / UHV) DC transmission converter valve light triggering thyristor level detection device. The device comprises a power frequency power supply unit, a resistance-capacitance measurement unit, a control unit, an RPU detection unit, a data setting and display unit and a light reception unit, wherein a thyristor level comprises a thyristor, a reverse recovery period protection unit, a thyristor damping loop and a thyristor voltage monitoring unit, the power frequency power supply unit and the resistance-capacitance measurement unit are connected with the thyristor, the RPU detection unit is connected with an RPU, and the light reception unit is connected with the power frequency power supply unit, the control unit and the data setting and display unit through fibers and TVM. Through the device, detection on converter valve light triggering thyristor level triggering, thyristor conduction voltage drop, damping parameters, RPU protection function and TVM board monitoring function is carried out, a problem that item-by-item detection is required during light triggering converter valve thyristor level test or overhaul because of no integrated test equipment is solved, and the device further has advantages of high detection efficiency, accurate data record and strong flexibility.