In order to solve the dilemma of traditional technology to prepare gun propellants with complex structure and explore a new way to improve incremental combustion surface of gun propellants， 3D direct ink-writing was used to design and print nitrocellulose-based gun propellants embedded with multi-cubic pores. The 3D printed nitrocellulose-based gun propellants embedded with multi-cubic pores were characterized by constant volume combustion and internal ballistic properties. The results show that the printed nitrocellulose-based gun propellants embedded with multi-cubic pores， prepared by nitrocellulose， energetic plasticizer， and solvent as printing materials， are in accordance with the expected design of incremental combustion surface. Due to the influence of the diameter of printing needle， the ratio of dissolved cotton， the ratio of alcohol/acetone， and the speed of solvent volatilization， there is a certain deviation between design size and actual size of printed gun propellants. The preliminary ballistic test of 12.7 mm machine gun shows that when the mixed charge of NC-120 and D-4/7 is 16 g and the charge ratio is 1∶1， the bore pressure is 314.2 MPa and the muzzle velocity is 854.1 m·s^-1. The stable and normal combustion of the direct ink-writing printed gun propellants embedded with multi-cubic pores in the chamber is realized. However， for the sake of practical application of printed gun propellants embedded with multi-cubic pores， several parameters need to be further optimized such as shape， web size， and the web size matching between inner and outer layer.