In order to solve the plug hole and distortion during nitroguanidine propellant cutting process, a high-pressure water jet cutting system device was designed, and its mechanical model was established. The jet cutting technology conditions were studied. The safety of cutting process was also evaluated. The combustion performance of jet cutting propellant samples was analyzed by the closed bomb test. Results show that, the jet cutting depths is inversely proportional to cutting velocity and strength of propellants. The kerf width increases with increasing target distance, which is consistent with theoretical analysis. Abrasive water jet can be used for cutting the propellants whether the solvent is removal or not, but water jet only used for cutting propellants unremoval of solvent. The max temperature of the nitroguanidine propellant surface is only 60 ℃ during the jet cutting process, which is below its initial thermal decomposition temperature(178.1 ℃). There is no significant difference in the combustion performance between the propellants cutting by jet and hand.