The invention relates to a cutting tool set. The cutting tool set comprises a motor, a tool, a tool fixing base and a positioning adjusting base. The motor is provided with a switching assembly, the tool is provided with a tool body part and a tool edge part, and the tool body part is connected with the tool edge part and the switching assembly. The tool fixing base is provided with a body, the body is provided with a penetrating channel and a thread structure, the tool and the switching assembly are arranged in the penetrating channel in a penetrating manner, the tool edge part protrudes outof the body, and the thread structure is arranged around the penetrating channel in a penetrating manner. The positioning adjusting base is provided with a through hole, the through hole is provided with an internal thread structure matched with the thread structure, and the body and the through hole are screwed together. When the motor drives the switching assembly to rotate, the switching assembly drives the tool and the tool fixing base to rotate to adjust the protruding distance of the tool edge part relative to the through hole through the relative relation of the thread structure and theinternal thread structure. Therefore, the height of the tool is automatically and precisely adjusted.