The invention relates to a high back pressure plasma igniter high pressure trigger and solves the problems that an existing plasma igniter is low in reliability and strong in electromagnetic interference under a high back pressure environment. According to the technical scheme, the plasma igniter high pressure trigger is established, the trigger comprises a power source, plasma moments, an isolating circuit and a voltage doubling circuit; the plasma moments and the isolating circuit are connected in series from the positive pole to the negative pole of the power source in sequence, and the output end of the voltage doubling circuit is connected between the plasma moments and the isolating circuit; the input end of the voltage doubling circuit inputs an alternating current of any form; the isolating circuit is a part of unilateral conductivity, the voltage doubling circuit outputs a high voltage direct current after being subjected to voltage doubling and rectifying, through the isolation effect of the isolating circuit, the high voltage direct current is not connected with the negative pole of the power source, so that the high voltage direct current breaks down a discharging gap between the plasma moments, and then the circuit connected with the power source, the plasma moments and the isolating circuit is switched on. The trigger has the advantages of being small in size, low in weight, convenient to use and reliable in start-up.