The invention discloses a triggering device for a pulse thyristor. The triggering device for the pulse thyristor comprises a light triggering signal receiving circuit, a coupling electricity taking circuit, a pulse control circuit and a pulse output circuit. The power end of the light triggering signal receiving circuit is connected with the output end of the coupling electricity taking circuit. The first input end of the coupling electricity taking circuit is used for being connected with the anode of the pulse thyristor, and the second input end of the coupling electricity taking circuit is used for being connected with the cathode of the pulse thyristor. The input end of the pulse control circuit is connected with the output end of the light triggering signal receiving circuit and the power end of the pulse control circuit is connected with the output end of the coupling electricity taking circuit. The input end of the pulse output circuit is connected with the output end of the pulse control circuit, and output end of the pulse output circuit is used for being connected with the gate pole of the pulse thyristor. According to the triggering device, a power supply source and an isolation transformer are not needed, so that the structure of the triggering device is light and small, and the triggering device for the thyristor is easy to install and high in reliability.