Separated high-energy gas fracturing device and fracturing method

The invention relates to a separated high-energy gas fracturing device and fracturing method, and belongs to the technical field of oil production processes. The method comprises the following steps that: annular energy-gathered ammunition, a circular truncated cone groove, a sieve pore baffle and a perforation shell are connected to a target layer position in a tripping-in well at the bottom endof a tubing string; an ignition device comprising a pressure bearing plate, an ammunition connector, a circular truncated cone plug body, ignition ammunition and the like are put in a well head, liquid is pumped into a well through a pump truck, pumping pressure is applied, the ignition device is fed into the well in a pumping mode and matched with the circular truncated cone groove, pins are sheared and broken, the ignition ammunition is pushed into the annular energy-gathered ammunition to be hollow, and an ignition switch is extruded by a firing pin; and internal materials release a large amount of heat energy, the