The invention discloses an Al2O3-Ti(C,N)-cBN ceramic tool material and a preparation method thereof, belonging to the technical field of materials. The ceramic tool material comprises main ingredients, auxiliary ingredients and additive ingredients, wherein the volume contents of Al2O3 and Ti(C,N) in the main ingredients are respectively 65-85% and 15-35%; the volume content of the auxiliary ingredients is 0.5-5% of that of the main ingredients; the content volume of the additive ingredients is 0.5-5% of that of the main ingredients. The preparation method comprises the following steps: (1) preparing main ingredients; (2) preparing auxiliary ingredients; (3) preparing additives; (4) ball-milling, mixing and drying the prepared main ingredients and a primary dispersing agent solution; (5) placing the main ingredients and the additives into a secondary dispersing agent solution, and performing ultrasonic dispersing treatment; and (6) ball-milling and mixing, then drying for at least 24h, then hot-pressing at the temperature of 1350-1450DEG C under the pressure of 30-45MPa. The ceramic material obtained by utilizing the method has high mechanical performance, can be used for processing intractable materials and the preparation cost is lower.