The invention discloses a high-
detonation-velocity low-sensitivity composite explosive and a preparation method thereof. The preparation method comprises the following steps: weighing hexanitro-hexaaza-isopentaisowurtzitane and 1,3,5-triamino-2,4,6-trinitrobenzene, adding deionized water, a surfactant and
zirconium oxide milling balls, carrying out mechanical ball milling by using a planetary
ball mill, filtering, washing with deionized water, and
drying to obtain an explosive mixture; adding deionized water into the explosive mixture, stirring, heating, dropwisely adding a high-
polymer adhesive solution, and carrying out vacuum treatment; dropwisely adding a paraffin solution while keeping heating, stirring and vacuum treatment; and adding a carbon material, stirring, filtering the material, carrying out deionized washing, and
drying to obtain the high-
detonation-velocity low-sensitivity composite explosive. The high-
detonation-velocity low-sensitivity composite explosive can effectively implement the explosive
detonation velocity of up to 9000 m / s or above, and the
impact sensitivity and
friction sensitivity are respectively less than 10%.