The invention provides a nano/submicron-structured B13N2-cBN super-hard composite material, a preparation method thereof and a cutter, and relates to the field of super-hard materials. The preparationmethod of the nano/submicron-structured B13N2-cBN super-hard composite material comprises the steps that amorphous boron powder and cBN powder are uniformly mixed according to a molar ratio of 11:(2-11) and then are subjected to vacuum heat treatment to obtain an initial material; the initial material is subjected to a solid-phase reaction/sintering under a condition that the pressure is 8-25 GPaand the temperature is 1200-2300 DEG C to obtain the B13N2-cBN super-hard composite material. Through the regulation of the temperature, pressure and time of the solid-phase reaction/sintering reaction and the interception of performance, the B13N2-based super-hard composite material with a large size and without an adhesive agent is successfully prepared, the industrial production can be effectively achieved, the material is applied to a cutter material, and the requirements of flatness and sharpness of a hyperfine cutter edge and the wear resistance requirements of a wear-resistant tool aremet.