In order to prevent the premature ignition of the combustible fuel in the primary ignition for fuel flow formation, the present invention provides a fuel injection device comprising: a base body having a first filling space filled with a dispersing agent in a vertically- ; A first igniter that is connected to one end of the base body to ignite the dispersion gunpowder; An arc tube enclosing an outer surface of the base body and filled with a pressure transmitter; An outer body surrounding the outer surface of the fire tube and having a second filling space therein to fill the combustible fuel scattered by the explosive force of the dispersing powder through the pressure transmitting body; And a second detonator for igniting the scattered combustible fuel after a lapse of a predetermined delay time from the ignition timing of the dispersion gunpowder.
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