Solid propellant composition according to an embodiment of the present invention, based on the total weight of the solid propellant composition, 0.1% to 20% by weight of a binder containing a hydroxyl terminated polymer, containing an isocyanate-based compound 0.1% to 15% by weight of a curing agent, 0.1% to 70% by weight of an oxidizing agent including a perchlorate compound, 0.1% to 10% by weight of a plasticizer including an ester compound, an amine compound, an aziridine compound, an amide compound , Or 0.1% to 10% by weight of a binder including a combination thereof, and 0.1% to 10% by weight of an antifoaming agent including a silicone-based, non-silicone-based, or a combination thereof, and the hydroxy group of the binder and the The equivalent ratio of isocyanate groups in the curing agent is 0.5 to 1.2.
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