The utility model discloses a quick trigger, which comprises a casing. An inlet and an outlet are formed on the casing, a connecting passage connecting the inlet and the outlet is arranged inside thecasing, a movable open-close device is arranged on the connecting passage, and is closed under normal state, and the connecting passage is in a closed state. The quick trigger is characterized in thatthe trigger further comprises a gas generator arranged corresponding to the movable open-close device, the gas generator generates high pressure gas to act on the movable open-close device, so as toopen the connecting passage and communicate the inlet and the outlet after triggered by an external signal. The utility model adopts the method that the gas generator generates gas to open the connecting passage on the trigger, the reaction time through the method is quick; and the trigger can adapt to the requirement of the rapid reaction restraining an explosion, and can meet the requirements ofexplosion suppression.