Modular Munition Launching Device Including a Pyrotechnic Jet Mitigation Device for Munitions. The modular munitions (20) launching system (1) comprises at least one munitions receiving chamber (4) forming at least one firing channel (18) for a munition (20) emitting a pyrotechnic jet (24) in a longitudinal direction (L). The modular system further comprises at least one mitigation device (32). This mitigation device (32) comprises at least one jet-breaking element (35) arranged to separate the pyrotechnic jet (24) from the munition (20) into at least two sub-jets (35), each extending in a direction different from the other sub-jet (35) and from the longitudinal direction (L). Figure for abbreviation: 4