In order to develop a micro-scale booster for Micro Electro-Mechanical Systems （MEMS） pyrotechnics with excellent mechanical properties. A fully soluble explosive ink was designed with hexanitrohexaazaisowurtzitane （CL-20） as the main explosive， hydroxyl terminated polyether （HTPE）/ nitrocellulose （NC） as the bonding system， ethyl acetate as the co-solvent， and a certain amount of toluene diisocyanate （TDI）. Inkjet printing technology was used to achieve high-precision charge molding， and the cross-linking reaction of isocyanate and hydroxyl group was used to enhance the mechanical properties of micro charge. The density， micro morphology， thermal stability， crystal form and mechanical properties of the samples were characterized by electron densitometer， scanning electron microscope， differential scanning calorimeter， X-ray diffraction and nanoindenter. The results show that the density of the printed sample is 1.70 g·cm^-3， which is 88.54% of the theoretical maximum density. The crystal form of CL-20 in the printed sample is determined by ε type change to β type. The apparent activation energy of thermal decomposition is 173.00 kJ·mol^-1， which is 13.17 kJ·mol^-1 higher than that of the raw material CL-20. The nanoindentation test results show that the elastic modulus of the printed sample is 10.47 GPa and the hardness is 0.22 GPa， showing good mechanical properties. Inkjet printing charge has good detonation transmission ability， and the critical detonation size and detonation velocity are 1 mm×0.18 mm and 8054 m·s^-1， respectively.