A fracturing device using a shock wave of a plasma reaction includes a partition unit for partitioning a reaction space such that a reaction medium is accommodated therein, by sealing a part having a plurality of through-holes among well casing of a gas well provided at shale rock layer so as to extract shale gas and a probe for applying energy to the reaction medium such that the reaction medium generates shock wave by a plasma reaction as the energy is applied to the reaction medium accommodated inside the reaction space, so as to propagate shock wave to the shale rock layer.