This avalanche triggering system includes a portable unit configured to be carried by an operator, the portable unit comprising a gas storage device configured to store an oxidizing gas and a combustible gas; an explosion unit which is configured to be launched by the operator or to be transported by a drone and which includes a flexible envelope configured to be filled with an explosive gas mixture, the flexible envelope being deformable between a rest configuration in which the flexible envelope has a first inner volume and an inflated configuration in which the flexible envelope has a second inner volume which is greater than the first inner volume, the explosion unit further including an ignition device configured to trigger the explosion of the explosive gas mixture contained in the flexible envelope; and a control unit configured to remotely control the ignition device.